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Take a look at your plugs, and check that they are all the same color at the burn tip. Check points, timing (with a timing light), I'd also check plug and coil wires to ensure that they all have continuity, and no cracked rubber sheathing. If you suspect cracked wires: check under the hood, at night where there is little if any light pollution, and see if you see any blue archs jumping from your wires to a bit of metal. You may be amazed at the light show going on under the hood.
Also check for air leaks at all hoses, and injector seals. Had read where one can test by having the car idle, and slowly pass an unlit propane torch (just the gas turne on low) over the hoses and injector seals, If there is an increase in idle...leak !! I've never tried this, sounds as though it should be effective. At any rate be real carefull not to allow a build up of propane gas in your engine compartment. I'd also highly suggest this be done outside, and not in a garage, or other sheltered area.
How often do you replace your air, and fuel filters ? If they are way over due, they become suspect.
Then you can get into valve adjustment, ECU, AMM, issues, and all the other little buggers, (fuel presure regulator, fuel relays, consistant fuel pressure, etc.) that can have one chasing all over the engine bay .
Good luck, and let us now what you found as the culprit. Begin with the simple, and work your way.
Enjoy.
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