Engine Performance problem
1990 Chevy Truck V8 Two Wheel Drive Automatic 168000 miles
I have a 1990 454 SS Chevrolet Pick Up. The truck starts well, runs well, and appears to still make good power for its age. When driven at high speed on the freeway - 70+ miles an hour - approx 4200 - 4300 RPM - truck is three speed automatic TH 400 - no overdrive - the truck stalls as I let off the throttle to slow down. A quick shift into neutral and cycling of the ignition switch causes it to start right back up. Truck idles fine and performs well at speed up to 55 - 60 MPH. I suspect the problem is ignition related, as when it re starts I have experienced backfiring and combustion of fuel in the exhaust system leading me to believe that fuel delivery is fine and that un-burnt fuel is going past the exhaust valves until ignition is restored. After the first incidence, I replaced the distributor cap, wires, and spark plugs. Cap and rotor are Accel, wires are spiral core 8.5 MM Accel, and spark plugs are Bosch platinum. The stall happened again today so I am replacing ignition module and coil this weekend with parts from Accel.
Any other things I should be looking for? Thanks.
have the same problem?
Thursday, February 11th, 2010 AT 2:35 PM