I have a 87tt mostly stock,85k miles,comming home from work 2 weeks ago it started to stummble/hiccup It wouldnt let me go faster than 40 or so for the rest of the way home (all highway driving),it keeps feeling like the ign key was shutting off then right back on or it would feel like it was studdering,if you let up on gas,it slows down but keeps running but at a measly 30-35 mph,,it never dies at idle,,,,Ive ckd the fuel pressure,37 idle,40 to 43 going down the road,changed out ign mod and coil pack w/known good one,no luck,ckd all vaccum connections/hoses`,all ok,today I re-did the engine grounds on the pass cyl hd,,no luck,still has a studder,,looked at TPS,all good here,,the radio never looses its clock setting so I`ve ruled out a bad battery cable. As I drive along and it starts acting up (which is just out of the drive way),I`ve wiggled the ign key to see if that helps,no luck. This car stars pefect,idles perfect,but it wont stop that studder,on-off,on-off,on-off act,you can drive it around the block at a 15-20 mph clip with no problem,but when you step it up it starts its act up,,,,any suggestions here ? I`m at a loss from here,HELP ! ! ------Jack