CAR STUMBLES/STUTTERS/HESITATES UPON ACCELERATION FROM DEAD STOP OR INCREASING SPEED SOMETIMES
2003 Chevrolet Venture
March, 17, 2012 AT 3:04 AM
New fuel filter, newplugs/wires/o2 sensor, dry gas, injector cleaner, no codes, certified mechanic found no misfires in computor history, 52psi gas pressure gauge reading engine off key on, 55psi at idle, 58/59psi on accelaration to say 50mph, even stumbles/hesitates at 58/59psi. Could it be coils? Fuel pressure regulator holds vacuum ok, sometimes it runs fine. Van has electronic egr. Depressing on accelerator when stumbling causes engine to perk up and car gets going. With brakes locked and gas pedal floored rpm changes by around 500rpm about.