Start by verifying proper fuel system operation, then check compression output on individual cylinders.
Check Clutch master and slave cylinders
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Check your compression on the wet cylinders are they the same or close to the sry cylinders good starting point
Check the valve timing and the ignition timing. If both are good then check the compression in all the cylinders.
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Check the compression of the cylinders you will have a low reading in the one with a bad valve
Do not completely fill the cylinder. Always check the hoses and fittings.
Check your plugs, check your plug wires, any of these can be malfunctioning.
Possibly one of the cylinders is misfiring. Try a tune-up and/or check the cylinder compression of all 4 cylinders.
Start by testing the compression. It should be consistent within a few PSI on each cylinder. Any cylinders that have little or no compression probably have a burned valve. If all cylinders are up, check the plugs, wiring and distributor.