If you mean the starter will not turn over the engine, check the battery. vbd
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if fuel injected check fuel pressure. chevy had fuel pump probs and ignition module/coil probs check for gas and spark
If it turns over very slowly, check for bad battery and ground connections. It should turn over quickly if you jump start it. If it doesn't, the battery connections are bad and/ or the battery is bad.
Dead battery. Recharge it and see if it will start. If not, remove the battery and go have it tested.
More information is needed. Does the engine turn over, but not start? Have you checked for gas and spark?
Since the starter is good but will not turn the engine over when hot, check the engine for free rotation. Turn the engine over by moving the crank by hand (with the ignition off.) The engine could be sticking when hot and not be able to turn over.
Cranks and turn over are the same thing. It may crank or turn over and not start. If that is the case, find out if it needs fire or fuel and go from there.