Cold engine start fine. When engine temp moves the needle to 1/4 to 1/3 it starts to stumble/hesitate when upon giving it the gas. After a couple of seconds of giving it the gas it clears and everything is normal. This cycle repeats until the temp gauge is in the midddle.
Mine did the reverse - fine when cold, then the RPM cycling from then on.
After trying everything in the book and throwing an embarrassing amount of parts at it, I found that by disconnecting the vac line to switch "A" that it stopped the cycling - see my recent posts on this.
I had to sit down and really think things through - e.g., what does the increase in temperature affect? Naturally, it affects a lot of devices, so it was/is quite a pain in the tush. I had to reread the FSM and the AZ info many times to figure the sequences, and I might have figured it out (yeah, right...).
'Course, mine was the opposite of your problem, but who knows?
Tom M.
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit." T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates." Mark Twain
