Working on a Hyster H60ft with a GM 2.4....starts good but it idles a little rough but does not backfire, the spark plugs are seized in the head so I can't check the plugs without pulling the threads out of the head and having to helicoil the holes. Its not throwing any codes, & the engine smooth's out when you get 3/4-full throttle. Have good spark coming out of the coil.....Any idea's on what it could be, lift has 3700 hrs on it.
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