Lurching problem and I'm out of ideas.

I have had two cars with lockup torque converters that had problems.

1st was a Chevy that would drop out the lockup at highway speeds, felt like a misfire.

Disconnected the wire that powered the lockup and never had the problem again.


Second is a Ford and at highway speeds the rpm will I crease 100 to 200 rpm every so often. Seems to be tied to the AC. With AC off never happens, with AC on max almost never happens. With AC on normal will happen every few seconds. Some online sources suggest the lockup drops out when the AC compressor cycles

It feels like the the car also has a misfire but the rpm I creases.

I have not found or looked for the wire to disconnect yet.

My vote is the lockup TC is not releasing soon enough OR there is an issue with the overrunning parts.

I personally don't see how the diff could be doing this unless the tires are different size or the OP is turning sharp while decelerating.

Just my 2 cents