something might have gotten in the intake when you took it off and then got in the engine which can destroy it. thats just a complete guess but its still very possible.
I did forget to put the oil cap back on but I didnt drive very far before it happened. Now that the stock intake is back on everything is working perfectly again
05 GTP. K&N Intake and magnaflow mufflers, plog-cross-rear exhaust with 3' DP. (Soon to be 3.6 and ported SC)