I have a code P0304 in idle shakes i already change spark plug and coil

Question

I check compression cylinder had 20 psi  but ,the car had only 35000 miles and the cylinder is to low why?

Answer 1

Hi there,

With compression that low, its either burned a hole in the valve or broken the rings on the piston. You will have to tear the engine down to determine which is the problem.