Check the fusible links down by the starter. I ran into one that was going nuts like that and it was loosing power to the transmission, fuel pump, and sometimes the engine ECM because of a corroded fusible link. The tech 4 engine was especially bad for this. You will have to pull on them to see if they are ok, you cant usually see the corrosion. Youll know if the link comes apart.
I ran into another one that was going nuts with the 3.3 engine and one of the injectors had a dead short in its coil. With it running unplug the injectors one at a time and see if the issue goes away. You should know instantly. You can also check the injectors with a multi meter.
If thats not the case, fuel pump, coil module, or a big vacuum leak.
You can jump terminals A and B in the diagnostic plug and count the flashes on the check engine light to get the codes if its OBD-1.
Last edited by Daytrepper; 08-06-2008 at 11:27 PM.