Thread: Stutters when floored

Same problem here. Car was running fine but I had an injector lock up, bought a new one to replace it and had them all cleaned and flow checked. Before I narrowed it to the injector ( Code was miss on cyl 6) I replaced the plugs with NGK TR6's gapped at .035, wires with packard wires, and replaced all 3 coils with the Summit coils. It runs fine at part throttle ( up to 3/4 throttle it is a rocket ) but full throttle it feels like it is stuttering. I am not sure if it is ignition or fuel, no codes. Oh, and the car is a 1997 GTP 2 door. Mods are SLP catback, Thrasher CAI, 160 thermo, aftermarket PCM, 3.4 pulley, ported blower. Everything ran fine until injector problem. I would like to put some headers on next but I need to get this straightened out.

Originally Posted by alkygto

Same problem here. Car was running fine but I had an injector lock up, bought a new one to replace it and had them all cleaned and flow checked. Before I narrowed it to the injector ( Code was miss on cyl 6) I replaced the plugs with NGK TR6's gapped at .035, wires with packard wires, and replaced all 3 coils with the Summit coils. It runs fine at part throttle ( up to 3/4 throttle it is a rocket ) but full throttle it feels like it is stuttering. I am not sure if it is ignition or fuel, no codes. Oh, and the car is a 1997 GTP 2 door. Mods are SLP catback, Thrasher CAI, 160 thermo, aftermarket PCM, 3.4 pulley, ported blower. Everything ran fine until injector problem. I would like to put some headers on next but I need to get this straightened out.

Actually putting those headers on would make your car run safer. Right now you're probably knocking quite a bit.