I have a 1989 gmc 3500 with a 454 engine. The engine dies out at 1000 rpm's. At 1000 rpm's the engine races and then lowers down to almost staling. I have replaced the spark plugs, spark plug wires, distributor cap, rotor, iac valve. Don't know what else it could be. Any help is great thankyou.
Dec 6, 2008 at 4:34 PM