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2002 3.4 liter, crew cab, 180,000 miles. Bought it near phoenix last week. The previous owner had "disabled" the check engine light and it wouldn't pass emissions. Any ways, fixed all the emissions stuff and CEL, driving back to the east coast, the CEL came on...PO770. Had the solenoid replaced in Asheville, ran it through three drive cycles, drove fine till last night. CEL again, same code. Same symptom, in cruise control, it will accelerate hard up to about 5 mph over the set speed then idle to about 5 mph below the set speed, then repeat the process. It has a new solenoid, the mechanic said the torque converter looked ok and it was achieving a good solid lock up fast. It doesn't drive too different out of cruise control, but there is a noticeable lack of smoothness when shifting, but ONLY when the CEL is on. Sometimes it's not on and it shifts fine, even in cruis control.

I'm thinking ECM/ECU or loose wire...

Any other ideas?
 
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