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Misfires idles fine

tbeutjer

New member
"Have a 1990 Dynasty with a 4.

"Have a 1990 Dynasty with a 4.3, 175. Carb cleaned, plug wires, new coil. Starts with just a bump of the starter, idles all day long smooth. Misfires on acceleration, cruising. Here is the fun part, driving straight misfires and sputters, turn right bogs down and almost quits, straighten up and recovers some and turn left and runs like new money. If someone suggests anti-siphon please include location cause I haven't found one yet."
 
Loosen the fuel filler cap to

Loosen the fuel filler cap to allow air to enter the tank. If it drives ok then the vent line is the problem. Anti-siphon valve is on the tank what the fuel line connects on to. See if the vent line has a low spot that could hold fuel thereby preventing the pump from siphoning fuel from the tank..
 
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