Just picked up a '96 w/ 3.6, 24 valve. Sarts fine, then after 5 minutes, the engine will stall down to 300-400 rpm, and if it doesn't die, it will surge to 2000 rpm and knock or "rattle". This happens every 10 to 15 seconds. What the heck? I've owned this 6 hours. Managed to limp it home. Will attack it tomorrow. Whether it's related or not, there is a hole somewhere in the exhaust, driver's side. Could it be screwing up my Oxygen sensor?