bboylobo
New Member
The slight stumbling is usually caused by a weak COP or a bad COP spring/boot combo. Unfortunately, the only way to find a weak COP is either to use a known good one and swap them out one at a time until the problem is gone (if it's only 1 that's bad to begin with), or take it to Ford, they have a diagnostic machine just to load test the COPS, and it will show you quickly. It's a little costly, but saved me a ton of time and aggravation. Ended up being 4 weak cops, and 2 that tested good, but the springs were worn out, and not getting a good connection. Replaced the 4 bad ones, and replaced the boot/springs on the other 4, and life has been good since. No stumbling or bucking at low rpms anymore.
I'm surprised that noone's mentioned seatbelts that won't retract, that's the one thing that really ticks me off with my car.
+1 on the seatbelt and BAD COP. i just got done replacing one after doing a DIAG at the stealership.