Engine jerks and couldn't start back again

[stormhunt3r]

Guys,I'm driving a E30 323i..this is what happened to me yesterday nite.my car starts jerking a day before and i tot of bringing to out to town for a round (maybe merajuk coz i din drive it for almost 2 weeks).Along Old Klang road, the engine jerks, but still moving after reving it for a while..then it got me to Wisma Genting..head to Jalan Ampang, then parked my car there and went for dinner..After we are done, start the engine and go home. The engine suddenly jerks badly and all of the sudden, the AC stop working then i tried reving it like usual but there's no response at all..Since i was at the traffic light, i tried to rev it but doesn't help at all..rpm stays at 1000 rpm..When the light turns green, engage 1st gear and move very slowly to the left lane and parked the car there..Pop up the bonnet, accelerator cable still intact..After i turn off the engine, couldn't get it started again even with jumper cables. There isn't any cranking sound (could it be the starter motor?)lastly tow the car back to the workshop..Anyone experienced this with E30 before? What could be my problem? I've spoke the my mechanic through the phone and he think it should be the problem with the alternator..