I've had this problem for a long time but nobody can figure out what's wrong. The car idles fine, runs fine, accelerates fine except at about 45 mph it stumbles. If I try to hold a cruise at that speed it stumbles. Any other speed it's fine. What in the hell could cause this? I've had my car in the shop a few times for other things and every time I tell them about this but they can never find anything wrong. Any ideas? Thanks.

EDIT: BTW, it's a 350 TPI.

[This message has been edited by Jesse87IROC (edited May 28, 2001).]

 

Ever check the ignition module? My Formula 350 did the same thing. The wires that connect to the pins on the module, under the roter, were corroded. Fixed that and it ran good again.

 

It's been awhile since I've checked that but the last time I looked it was okay. And the module itself is fairly new.