I have a 98 camaro and around 75,000 miles i had the same problem and i had to change the spark plugs, wires, and a couple of coils. i had to change the coils for the 1 2 4 6 cylinder. the coil is cheap go to autozone plug your car into the computer to find what code is getting thrown out and find what cylinder is misfireing and change the coil. 2 bolts and your done
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Re: 1994 camaro v6 3.4litre
Generally if it is a sensor you should be able to retrieve a fault code. Other things to chek, timing, vacuum leaks, EGR. valve, fuel filter, plugged injectors, spark plug ( gap ), lead wires, distributor cap, rotor.Hope that this will help you. Good luck and remember to rate all replies you get. Thanx.
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You could have a faulty Crankshaft sensor, when you went through the flood, the crankshaft sensor wire leads may have gotten damaged or the sensor it self and your going to need to replace it. The sensor sends signal to the ECM which will control your fuel and and timing to each cylinder. Start with that and the sensor is located on the passenger side on the harmonic balance and you can pick on up at Auto Zone, Part Source ad they will have the step by step instructions for you to replace the sensor. Here is a link for you to also retrieve any DTC codes your ECM has saved that may be causing your engine's issues. http://www.troublecodes.net/GM/
I worked on one of these the other day and what fixed the same problem it sounds like is I changed out the distributor cap and rotor. the rotor can be a pain to get off. and also don't cross any plug wires take one off at a time and put it on the new one.
Listen for a hissing sound you could have a vacum leak . spray carb cleaner around the thodle body and the intake to see if you have a bad gasket or just needs to be tighting.also check the choke and throdle pationing sensor it could be stuck open!
if you are not the original owner then the previos owner may have set the idle higher htan normal, take off the throttle body then unscrew the little screw, SOME, if your car runs at a high but rough idle then you may have a vacuum leak.
it could be your timing belt is slipping or missing some cogs .
roughly 4.5 hrs on garage time / took me 4-5 hrs just to get the belt off / pile of work involved .change the timing belt every 60,000k or lol welcome to the car world where you will be nickeled and dimed to death ... happy new years