Hello, if you replaced all the spark plugs and ignition coils. Check and see if you check engine lights on? If it is, go to AutoZone or someplace that will read the codes for you. You have three possibilities that I can think of, one a vacuum leak, check you're vacuum hoses for cracks. Two, you might have an injector that stopped working. You can take a screwdriver and put all on the injectors while the engine is running, if you hear a clicking noise the injector is working. Three, you could have a problem with a mass airflow sensor or throttle position are sensor, which you would need some special tools to test with. You still could have a problem with the ignition system you could have a possible broken wire that leads to the coils. Just take it one step at a time, if this is beyond your ability, you might wanna take it to a mechanic. Hope this helps you out.
SOURCE: car has intermittent miss
It is 1/2 hard
3 or 4 are going to be under the intake manifold, 3or 4 (depending on your engine of course) are going to be on the other side.
Obviously the 3 or 4 under the manifold are going to be difficult, remove the intake, replace gaskets, etc..
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