The car shook very rarely before the spark plugs were replaced, hardly at all. Then immediately after it started to roughly idle and fluctuate rpms. The people that did the spark plugs for me took an hour to do it, is it possible they didn't gap them right or didn't do it correctly, and that's what's causing the problem?
Yes, first it shouldnt take an hour to do spark plugs, also there may be an HT lead loose, but most likely incorrect plugs, wrong gap or worse, a cracked plug if they did them up too tight. I would remove them and check everything asap as it will be putting stress on your coil/coils.
SOURCE: 1995 Chev S10 4.3L V6 rough idle and under power
This make/model has a chronic problem with EGR clogging. If you have a dashboard indicator showing "check engine" most likely it is a trouble code indicating and EGR (exhaust gas recirculator) valve problem. Symptoms are rough idle, and surging and stalls.
What happens is sediments from the exaust manifold get sucked up into the valve when it opens, then stick in the valve and keep it from closing. When the valve is open when it should be closed, the engine runs very rough.
I removed my egr and then dislodged the sediment (pea-sized debris) and then re-installed the valve. Three days later, the same "check engine" and same rough idle. I must have did this at least three or four more times.
What I found that gave me a permanent solution was an aftermarket filter gasket that keeps debris from clogging. I don't remember the name of the product, but a search for "EGR filter gasket" may lead you to the product.
Install the gasket between the EGR and the exhaust manifold and you should be good to go. Note: on 1995 and newer models, disconnecting the EGR from the wiring harness (common on R&R) may require the computer to be reprogramed.
SOURCE: Rough idle, Car shakes, sputters and misfires upon acceleration
It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.
SOURCE: 98 Chevy 5.0 fast idle
try cleaning the throttle plate with the right cleaner . from a auto parts store.
SOURCE: 1997 2.2L base Cavalier idles rough and randomly stalls
Have they checked your TPS sensor as this is the most common cause for rough idles and stalls...
SOURCE: Burning smell,check engine light-misfire, rough idle 96 cavalier
Sounds like there is a blown piston, to be sure have a compression test done on that #2 cylinder, if the reading is low, then you'll know.
A friend of mine had a 95 that did simular things only a little more,
it started smoking, dash lights flickered, etc. Finally, he had to get rid of it, the piston rod went through the engine block.
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