[Mac626]

1992 TC V8 / 130K miles

Problem 1:

I recently started having a problem with my TC. It will run fine when cold, but after driving for about 15 minutes it shows some strange behavior. When idling in gear with the brake on, for no apparent reason the car will begin to idle rough. One second it's smooth, then it hitches, becomes irregular and dies if I don't give the gas pedal a tap. This lasts for about 3 or 4 seconds and then it's back to smooth. It may be unrelated, but once the idle problem starts, I also have noticed that the downshift becomes very hard, and jerks the car badly. If these problems are related, I am assuming it might be a vacuum issue but have no idea where to look. Any ideas?

Problem 2:

This one has been driving me crazy for some time. When I hit the brakes the front end shimmies just as if one of the rotors is warped (pulsing). I have replaced both front rotors and even had the new ones turned. Next I thought it might have something to do with the anti-lock brakes, so I pulled the fuse; but it made no difference. Is there another component that could cause this type of thing?

Thanks for any help.....

Mac