1998 Chevy Blazer Misfiring issues.

1998 CHEVROLET BLAZER
160,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
RMZVEGAS
  • MEMBER
  • 1 POST
My 98 2-Door Blazer has been misfiring since I bought it. If i drive it easy, it is fine. But if i try to floor it, it usually just revs up and misfires really bad, sometimes it just free-revs usually around 3600rpms, but I'm confident it's not the transmission. If it's in neutral and I immediately step on it from idle, it misfires. but if I keep smooth steady throttle increase, it doesn't misfire at all.

I changed the plugs and wires last week. I pulled plug number 6 and the electrodes were pretty much touching, I fixed the plug gap and it didn't misfire at all on the way home, but started again the next day.

2nd gear is pretty weak it feels like to me, I feel like I have alot less power than I should on my truck. I think I might need a fuel pump, but thought about replacing the cap and rotor.

Any ideas guys?
Mar 18, 2009 at 8:51 PM
Advertisement
Avatar
RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Mar 19, 2009 at 5:18 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.