Problem bucking/play in drivetrain. help
 

i have a 87 5 speed na s4 fc with 67k, i have a problem with the car "bucking", it feels like there is play somewhere in the drivetrain. at low speed 1st and 2nd its easier to feel, the accelator is too touchie. im thinking mabie its the worn out driveshaft or subframe bushings worn out.

if anyone knows about this please comment, thanks

Ive had those exact same symptoms when my tip in was too lean or I just had a lean spot in my fuel map.

i had an n/a fc with a bad driveshaft once, if you let it rev down in gear it would make an insane clunking and feel like the rear was going to fall out

thanks guys

i also heard it can be the tps sensor, witch is a spring loaded sensor that sits on the throttle cam loube, how do you adjust it? tighten the spring feeler clock wise, or loosen it counter clock wise
this is the tps sensor
http://mazdatrix.com/pictures/o-elect/86-88ThrotB.jpg

Thats a plunger style sensor. There is another section that goes to that, that you would adjust. Circled in pic, remove plastic cap if you have one and use the screw under to set tps. Once the car is full warmed up and the cold idle thermowax cam has disengaged from the tb adjust the TPS to read 1volt at the ECU.

https://img.photobucket.com/albums/v...a_7/s4_tps.png

Its the front differential mount. I dealt with it for years not knowing.