I just put new plugs and wires on my car. It ran great for about 2 days, then it started running rough. The RPMs would vary from around 800 to almost 1500 while in park. When in drive, with the break on, the car would shake a lot and the RPMs would range anywhere from 400 to 2500. As long as the car was moving it wasn't that bad. I noticed a loss in HP and that it was rough, but I didn't worry about it too much. It kept getting worse (or maybe I just had to wait at stop signs or lights) I drove it to my friends house today and I started it up to leave, and it died with in about 5 sec, so I tried again, it died almost instantly, I tried again, it died instantly, after that it wouldn't start at all, it just tries to turn over. Recently on the car, I have replaces plugs and wires, O2 sensor, Throttle Positioning Sensor (I think the box says TPI sensor) alternator, water pump, battery, and the air filter. My friend and I checked a few things on the car..... the fuel pump is working, and there is a spark, the car just wont start. We went to Wal-Mart and bought a GM code checker to see if the car had diagnostic problems (like $25, so it was a cheap one, I don't know how good it is) But, it showed that there was no problems w/ the car's computer......any suggestions would be very greatly appreiciated. Thanks.......

 

Sounds to me like your fuel pump is toast, get a pressure gauge and check it. Also check for vaccuum leaks. Since you have no codes it probably isn't computer related and should be fairly simple to find. Hope this helps. Do you race at Thunder Valley any?