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my engine ran fine when it was parked it sat for a week now will only run on 3cylinders. new spark plug its gettting spark has compression all are same for the 4 cylinders. cam looks ok valves not out of adjustment. and still will not run on all 4 any ideas?

tryt getting a new cap and rotor there cheap so if that's not it your not gunna loose that much but I would try that

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currently working on my 1977 luv truk

Sorry didn't read it right but I would think a bad plug that's not firing under compresion . What color is the spark? Is it bright. Or weak?

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currently working on my 1977 luv truk

bright blue. the only thing i can figure is somthign is plugging my intake manafold

Then I would check the intake valve to see if its opening enough I wouldn't think any thing would be blocking the intake manifold unless you dropped something down it

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currently working on my 1977 luv truk

Check for vac. leaks with some carb cleaner and don't forget the EGR valve where i suspect i have a problem with mine running on 3 cyl's until warmed up then runs on all four.

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1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s

i still have not figured out whats wrong, im putting in a g200 instead. but i hat do use my flywheel and clutch cuz the one on the 200 was bad