99 GT buck/hesitation/bump during accel?!?

warrior86

New Member
Apr 19, 2005
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Hey guys, im new to this forum.
I recently purchased a 99 mustang gt 5 spd with 28k miles in mint condition. After two days of having it, the clutch went (the mother drove it sometimes). I really didnt do much driving with it before than. We put a new clutch in (ford king cobra) and i waited to get on it.

I notice that whenever the engine is at semi low rpms and i give it gas, there is a slight bumpyness/rumble in the acceleration and i even feel it in the shifter. This happens whether im starting from a stop in first ...or in fifth on the highway. And YES, i know how to drive. Im new to mustang, is it just how they are when they try to pull at low rpm's? I have a Hurst short throw shifter in there too if that means anything.

I would say it is the clutch, but this seems to happen after the clutch is engaged. Let me give a scenario....

Say im in stop and go traffic... i am at a stop and want to get going a lil bit. I put it in first and let the clutch up while giving it gas (obviously) and i feel the clutch completely grab. Now lets say i stay at the speed it grabbed at and just eek forward. Mind you im still completely in gear and at 1500 rpm lets say. IF i hit the gas to accelerate...it WONT be smooth. There will be like little bumps that i feel in the acceleration and in my hand touching the shifter. Same thing could happen if im cruising at 60 is fifth at about 1500 to 2000 or even higher and give it gas. ALMOST.....ALMOST as if traction control is activating...but it cant be because i have it off and this car is nowhere near outta control! Any tips? My friend who knows mustangs pretty well wasnt sure either. His only guess was that maybe the mounts were loose??? Thanks for any help as i really love my mustang and want to correct any possible problems before they do damage. thanks

btw, i ONLY notice this when the car is IN gear. If i just rev it in neutral or with the clutch in everything is fine.