HI, I recently test drove a 93' 300zx non turbo thinking of purchasing it. the only major problem i found wiht it is in any gear even neuatreal(its a 5 spd.) at around Regular idle to a little below 2k teh engine starts acting like its idling rough. i had my dad(He went with me im only 18) rev it while i looked at the engine to see if it was a engine mount but it didnt even move that much(just the normal shake for an engine) anyways my question is what could cause this? could it be an injector? or maybe it just needs to a tune up?
Thank you in advance,