96 spyder GS Code P0300 (multiple cylinder misfire)

1996 Spyder GS with 2.4 Liter engine.

Driving home one day, the tac went crazy..going up and down. I was able to crawl home. Checked out the plugs and the 2 middle ones are not firing. I proceeded to perform a tune-up. It's got 115K miles. Put in new plugs, cleaned out K&N air filter, new plug wires. Still the same problem. Then I went and ordered new ignition coil. Installed them and it fired up fine for 3 minutes.. then the engine vibrated again like before. I hope I didn't waste $150. Any ideas anyone?? What else can I check? Please help.

when you took out the plug wires, are there any oil, water or greece at the plug well? is the plug wire connector full of oil? and what kind of spark plugs do you have

The plug wells were clean. The plugs are OEM NGKs. They were a worn somewhat but i replaced them.

Its either your cam position sensor or crank position sensor that has gone bad

A mechanic buddy of mine looked it over and he found out that it's an electrical problem. A wire was rubbing against the chasis and was worn thus causing a "short". sheesh!!

^^ Common problem from what I've heard.