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Rlamburgy

Rlamburgy 6/11/2010

1998 GMC K3500 Sierra SLT 8 Cyl 7.4L

Engine

What could be causing the truck to run like it is missing out and smells rich?

2 days ago had left cat replaced and yesterday had right one

1 Answer


Nissan Technical Advisor

There are many possibilities, like blown head gasket, defective ignition coil/s, incorrect ignition timing, bad O2 sensors, bad ECM. Did you already check the engine ,with a scan tool. That should be the first thing you did. Get the codes and post them here so that we can help you solve this.

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