My 1990 PMC Chevy 305 is running great...EXCEPT that between about 1800 and 2500 rpm it surges, almost like I am pumping the throttle. When it starts to ssurge, I push up the thottle and it settles in nicely at about 2800 rmp.
What's up?
One theory, and please comment. With a lot of past fuel problems, I installed a second fuel filter this past winter. Is it possible that at these mid ranges the fuel pump is not putting out enought pressure, but at the higher rpms (above the mystical 2800) it regains control?
I would suspect that there is crud in the tanks as well, but that does not address the mid-range issue very well.
What's up?
One theory, and please comment. With a lot of past fuel problems, I installed a second fuel filter this past winter. Is it possible that at these mid ranges the fuel pump is not putting out enought pressure, but at the higher rpms (above the mystical 2800) it regains control?
I would suspect that there is crud in the tanks as well, but that does not address the mid-range issue very well.