thats a fairly insufficent discription... try going into some details
I've checked the plugs while cranking. there is spark. and I'm getting proper fuel and pressure. the engine just rolls and will not start. I'm lost
so we got fuel spark and were missing something ... Air. Check all the air ways clean the maf and check the crank case hoses they are most likely clogged.
Ignition timing off...Did chain or belt skip? Does it crank at really fast speed..?
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