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2000 ls 3.0 missfire
i have a 2000 ls i replaced all plugs and cops but still misses under load once up to temp any suggestions
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You didn't say but I am assuming the "check engine" light is not on?
The problem that is causing your misfiring are your "ignition coils" you may have an oil leak, that leaks through the coils and oils up your spark plugs which causes a bad combustion when the electric current runs through and causes really bad misfiring and seem like your car wants to die, choke, or lose power.
If the misfiring is really bad, it causes your whole car to stop and you cannot turn it back on, maybe sometime after about 3 to 5 minutes then turn it back on, but it will continue to do that until the "Ignition Coils and "spark plugs" are replaced.
But I think you can do it yourself, just remove the cover where the "Ignition Coils" are at and disconnect the wiring that connects the "Ignition Coils" just unscrew the wiring cables aside, then you can remove the "Ignition coils" with your very own hands, just pull them out, after you pull them out use a Rachet and the proper socket and remove the "Spark Plugs" if there is any oil leaks just clean out the slots where the "Spark Plugs" go in. After doing all that replace all components with new parts. The "Ignition coils" may be a bit expensive, they run up like about $50.00 dollars a piece.
But since I had a mechanic do it for me he charged me $150.00 dollars each for "ONLY" the ignition coils, plus new spark plugs and all labor, my cost came up just a little over $1,500.00 dollars.
But to make sure they are the ignition coils see if they have oil leaks or oil on them, (the ignition coils and the spark plugs should not have oil on them,) and check all of them, because if one is bad then the car won't run evenly and if you change only one, there is a very good chance it will be back the way it was, they all must be replaced at the same time, to have a good smooth ride and fire combustion and have the same fire power. If you change one "Ignition coil" then the car will want to run off the newer "Ignition Coil and the spark plug" which I did first and it was a bad idea, then I had to go back to the mechanic and replace all of them.
So this is a warning.
Just check the "ignition coils & spark plugs" and if they look fine then ignore this response it could be a different problem.
But I had major problems with misfiring and I finally got it fixed and I'm happy with it, it's been 3 years now and no problems yet.
Also I tried to replace just the spark plugs, but that was not it. The problem came back after a week later, but I notice my "Ignition Coils" were all oiled up which was bad.
So just check these problems first and good luck. This will save you a bundle of cash...!!!$$$