I have gone through the many pages about this, and unfortunatley seems like everyone found a different problem. Trying to figure out mine. I have a graph from a AutoXray scanner, and having problems pinning the problem. Has happened the past few weeks in cold temps about 25F through 60F. No SES light. TCC is locked during the problem, unsure about TCC duty cycle range should be at. No bad cyclinders are showing, so I assume at this point no misfire. Any help would be great, if you need other readings I can get them.


http://i2.tinypic.com/rcpyfl.jpg

thanks for looking

edit: the white line is when it happens first, I think the hops in mph are the next few surges. The black line is the data showed at the third column

Typically surging in the cars with TCC is called Chuggle (in case you have a manual..that'* their technical term)

Usually found as an ignition related issue, spark plugs, wires, corrsion at a coil post etc. Also can be a dirty throttle body.

The reason you notice it is the TCC is locked and not slipping, therefore every little issue is felt in the car.

How old are the plugs/wires and what quality level are they.

Plugs are AC Delco, wires not possitive but both changed about 1.5yrs ago. I guess it might be about time for a new set. I took off the boots on the coils and they look fine. I plan on diving deeper into it on thursday, first day off work.

Thanks for the help