The check engine light went on in my car we had it hooked up and it said the o2 sensor was bad so we replaced that. One week later the engine light came on again. Then it said that the spark plug was miss firing. So we replaced all the spark plugs and wires. It still had alot of loss of power so I brought it into the Chev. dealership in my local town and they replaced the cam sensor and shrador valve. I was driving home from Minneapolis when my radio turned off. Next thing I knew I was on the side of 94 with a bad Alternator and battery. After replacing that my car still has no power and shakes extremely bad. When I am about to stop at the lights it feels like your are going up on a roller coaster. It also makes a very funny noise. It sounds like it revs up them slows down. We then brought into the chev. dealership in another town and they said after doing many diagnostic testing that it was probably my fuel injectors. Which now he said it isn't even worth the money and effort to fix it. He was only going to give me $300 to trade it in! I have only 130.000 mi on it and change the oil reg. and keep up on all maintenance. Just yesterday my water pump went out. I noticed alot of smoke opened the hood and there was dex flying everywhere. Any suggestions on why it is shaking so bad and if it is the fuel injectors? Very frusterated at this point and am ready to throw in the towel.