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Recent content by BigGib

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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I haven't had a chance yet to check the indexing of the distributor, still waiting for the TDC tool. I do have a couple of pictures of it that show what I'm talking about with the coil wire and how it lands right in that bracket. That's what makes me think it could be a tooth off. Also pulled...
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I appreciate the info! What's odd is I've tried 2 new caps and it just keeps getting worse,no improvement at all. The threads are stripped on my distributor screw holes so I have one of those plates under it that holds the cap on tight as well.
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I appreciate the help! Going to check the indexing on the distributor probably tomorrow and then I have a local guy who is going to flow test and clean the injectors.
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    Thanks, I will try this next! It runs great at WOT and below 2k,so if this is the problem is can't be far off. It's definitely getting worse though. I also have a noticable surge at idle now where the RPMs will raise like it's catching itself and then will settle back down. Not sure if...
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    Since it's been moved already,I wonder if it's just in the wrong position. Is the only way to verify this checking that the cam offset/retard is at 0 degrees, +/- 2? I don't currently have a scanner that is showing cam offset.
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I'm assuming it's throwing the phasing off? My coil wire plug is so tight on the cap against a bracket, I'm wondering if it may be off one tooth? Maybe the cam offset is also off?
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I'm curious why when I rotated the distributor a couple of degrees, it caused it to miss fire and pop so bad it wouldn't run above idle?
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I'm curious why when I rotated the distributor a couple of degrees, it caused it to miss fire and pop so bad it wouldn't run above idle?
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I tried swapping out the cap and rotor and cam sensor today,and I noticed a lot of rotational slop in the distributor. I believe this should be springing back with some tension for the mechanical advance right? Below 2k wouldn't it be at base timing and then above 4k it would be fully advanced...
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I unplugged the in gear switch,no improvement. Also tried removing the vent hose from the tank and no improvement. Also replaced the anti siphon valve with a straight fitting.
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I will try that next! I have to get the fuel/vent line figured out first, I'm low on gas and can't currently get any in the boat.
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    Yeah, number 18 on this diagram. I've talk to a couple people online that think it could be timing chain stretch throwing off the timing,but I would think it would run bad at all RPMs then? It only has 260 hours
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    Yeah I just have the one switch back on the throttle plate that I replaced, it's a Bravo 3
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    07 350 Mag MPI bad miss/stumble 2k-4k RPM's only under load

    I also tried to get gas today, and you could see the gas in the fill tube like it was over full, but Last time I filled up last season and I've put probably 10 hours on it this year. It kept kicking off and spitting, not sure if it's a clogged vent? Also not sure if it would run so well at WOT...
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