Engine Performance problem
1997 Chevy Astro 6 cyl All Wheel Drive Automatic 184615 miles
First, here's what I have recently done: Changed sparkplugs and sparkplug wires twice, changed distributer cap & rotor, had MAP sensor tested (good), had fuel injectors cleaned, replaced PCV Valve, Fuel filter, new fuel pump (was missing before fuel pump went out), had catalytic converter cleaned out. I have also just purchased a new Ignition Coil, but I have not installed it yet.
Problem: Service engine light is on. Sometimes goes out, sometimes flashes then stays on. Scan code shows "Random multiple misfires" (forgot actual code #). Engine runs really rough (missing) especially when taking off from a stop until it get's into (I believe) 3rd gear. It helps to let off the gas pedal until it shifts. It also sputters or miss big time when traveling at higher speeds (60-75). Some days are worse than others. But it's now missing most of the time.
I'm running out of ideas as to what is causing this problem. The engine has backfired a couple of times, but it hasn't backfired lately. I now also have a muffler leak. I'm sure this is a cause/effect case. The bottom line is that I need to get the engine mis-firing taken care of before this causes any more problems.
Thanks much. Mrb
have the same problem?
Thursday, June 5th, 2008 AT 9:59 AM