nicku

i got a s13 redtop with t28 stock injector , stock boost, safc and wideband. the car is not tuned YET. i use the safc for dec. air function so far.
there are two weird symptoms on the car now.

first, when i am steady on the throttle, sometimes the car decelerate for a little bit. its more like you suddenly let go the throttle for a little bit. but i didnt. it happens when the car is at low rpm.

second, one day after a long drive about an hour on highway, my car start shaking. it starts shaking on 2200 rpm. its like engine mount, but the engine mount is good. and the wideband doesnt show the car is lean or watever. it feels like either engine mount or exhaust, but it only happens when the car is loaded.

anybody has any idea?