About 6 months ago it started hesitating when driving about 50 mph, it has got worse, hesitation, no spits or sputters. I replaced the spark plugs, they did have oil on them and were worn, but still have the same problem. I cleaned the MAF sensor with brake cleaner, still have the hesitation, won't pick up speed until the motor warms up. When the motor is warm it runs fine...any suggestions?
SOURCE: 2000 silverado 4.8 v8 runs bad when it is cold out side.
Try replacing the coolant temperature sensor for the injection system.
SOURCE: 98 Astro Van,when warm hesitating, stalling
WELL YOU CHANGED ALMOST EVERY THING EXCEPT IGNITION CONTROL MODULE........
SOURCE: I have a 96 cavalier z24. when I start it up the
See if there is a code in the computer and work from there. Find someone with an OBD2 code reader. If I'm not mistaken an OBD2 code reader works on 1996 and newer models. Could be a bad coil and you don't notice it when you first start it until it idles down, to check for that, while the engine is running, pull each wire off the spark plug, Each time you do that you should hear the engine struggle. Then pick back up once you plug it back to the spark plug. If you pull one and nothing happens to the engine, that could be all or part of the problem. Hope this helps.
SOURCE: my blazer sputters when cold and hesitates when
your timeimg is off if theres a distuributor there just might be u need to losen the bolt right below the distuributor with car off once loose start car it only needs to be loose enough to turn startcar turn ur tarding it upping the amount of gas and air intake u absoreb turn it to the right ur engine should idle hire dont turn to must at all little by littleas u turn hairturns at a time get dont shut hood alll way get in go down the street punch it if it feels good gets it and goes ur good if not keep repeating prosscess until it feels right to u
SOURCE: 2002 Chevy Malibu 6 cyl - hesitates and sputters, lags on hills
P0300 Random/Multiple Cylinder Misfire Detected
P0404 Exhaust Gas Recirculation Circuit Range/Performance
P0207 Injector Circuit Malfunction - Cylinder 7
P0500 Vehicle Speed Sensor Malfunction
P0600 Serial Communication Link Malfunction
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