Q: I have a 2000 GMC 5LT with a small V-8 vortex engine. It starts great when it is cold. But after it warms up, it’s hard to start. I churn and churn and then it starts, but the engine shakes and sometimes stalls. Had it tuned up, fuel filter, new wires and plugs, cleaned throttle body and injectors, but it did not help. It has about 113,035 miles. If I let it idle for a long time the “service engine soon” light comes on. Can you help?
A: The problem sounds fuel related, not spark. The good thing is the check-engine light does come on and sets a fault code. A simple fuel-pressure test and professional scan tool will help us greatly. While trying to start the engine, monitoring all related sensors will point us in the right direction. I have even seen a small air leak at the fuel filter cause starting problems with out leaking gas.