do all the plugs have to be removed cause all i did was take one spark plug out put in the tester. pushed gas pedal down and cranked it like 3 time each time like 4 secs and i did it one cylinder at a time with all the other plugs in. would that make a differences if the other plugs are still in? i drove the car to the store before i checked it so it was warm. and when i put the oil in the cylinder with 130 it only raised it like prob by 5 psi so now im guessing its my lifters? that has a problem
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