bought this car with blown engine . swaped a used long block in runs good. The problem is arter it is warmed up and shut off the next time it's driven it will stumble for about 10-20 seconds while acelerating after that it's fine till shut off and started again ?? checked timing,changed fuel filter has new timing belt any help thanks John

 

CEL (check engine light) on?

 

yes but only code is for the stock breather being un pluged cause it has an after market breather

 

alternator??

 

how would that cause it to only stumble after re start and accelerate

 

What is the CEL code? Number to be exact.

When the engine is completely cold does it start and run ok?

Also check all the plugs and plug wires, I have seen cars start and run good when cold and warm up fine, then after shut down and allowed to cool a little will have trouble running from a cracked procelin on a plug electrode. Just a though. Let us know what you find.