I have a 91 MR2 N/A when i am driving and I'm in a low RPM( under 1500rpm's) I experience a forward bobbing motion( I am not giving it any gas). I would describe it as someone putting their feet on the back your chair and slowly extending their legs and retracting them. It happens a lot in rush hour. It it rather annoying. My clutch is dead and my car is sitting motionless now. I plan to do a repair before Christmas. Things I'm thinking it may be: Warped Fly Wheel, Fuel Injectors, Oxygen Sensors or maybe something clutch related. I don't thing it is spark plug related because they are rather new. Any Ideas, please post.
Hey..dont own an MR2..I have a Paseo..
But anyways..my car when I'd start it up would hesitate upon acceleration before it wasn't warmed up..and kind of bucking motion. I replaced the O2 sensor and never had a problem since...try that..maybe.
I once put the throttle position sensor on a Nissan, on a little ascew and it caused the car to buck on under constant throttle. I went back and adjusted it and it drove normally after that. I believe your tps is different, but it could mean it's going bad.