98 JDM type R. car will only shudder under load. Especially during highway speeds. Thought it was wheels, so got them all rebalanced but nothing. Engine revs fine when I step on the clutch but as soon as it engages again the car will shudder like it has a warped rotor when I step on the gas. does it in all gears. Didn't start doing it till after a car wash!! weird. could it be differential, bound axel? or clutch? was stuck in traffic two days ago and after I got off ramp the car smelled like burnt clutch for a good 15 minutes.....could this be the culprit? ACT HDSS clutch with prolite flywheel..... any recomendations would be greatly appreciated.