96FLMustang

I have searched and searched. Can't find the answer. I just bought a 2000 Mustang GT automatic. After running at operating temps, cruising at 40 miles an hour, the car will jerk a couple of times then run ok. If I give it more gas it runs fine. Its only when in high gear maybe 4th and then it jerks a few times. I'm really hoping its not the transmission. Any help is greatly appreciated.

dawson1112

My 2000 gt would do that before I changed the oxygen sensors.

96FLMustang

Did you change all of the 02 sensors? Did it fix it?

dawson1112

I only had upstream sensors since mine was cat less. So just the 2 before the cats. Those are the only 2 the pcm uses to adjust timing and fuel. It fixed both the 2000 GTs that I had. But before you go through all that hassle, have the codes scanned and see if anything is coming up in the computer.

Urambo Tauro

It is possible to get a slight misfire that won't trigger a code, which can result in a shudder. I've seen loose spark plugs do that.

Another common cause of shudder is transmission fluid. It might be time for some fresh Mercon V.

DRAGUL

Could very well be a coil starting to fail.

96FLMustang

I added some Mercon V. Fluid looks and smells good. I hope its not the transmission. It only happens cruising at around 40 mph and in 4th gear. Kind of like chugging along.