Check for diagnostic codes. Test the TPS alignment when cold and when hot, particularly the IDL switch. Test, inspect and clean the ISC (idle speed control) valve. Check to see if fuel is coming from the cold start injector at ay time other then when the starter is cranking... make sure it's clean too and that it sprays when the starter is cranked (read the TSRM on testing it). Lastly, test the air flow meter. The VAFM is relatively easy to test where as it's harder to really know with the KVAFM that the GTE uses unless you've got an accurate scope and know how to use it.
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