I started having problems a few months ago when i noticed my car idled a little rough, the check engine light came on and it read that cylinder #4 was misfiring. i took it to two different places including dealership, you couldn't tell me what was causing this problem.

A few weeks ago my car started to literally "shake" when it was stopped at a light or sign , the RPMs were running high on the freeway, and when i drove it at 40 mph it felt like it was going to stall out, the check engine light blinks and/or stays on repeatedly every day, and the compression of cyln. 4 is at about 50lbs.

Is the only way to fix this is by replacing the cylinder head? that's what the dealership said... i need help figuring out this problem, i'm so frustrated!!

Could be sparkplug wires, but with PSI that low Im guessing its headgasket or a bent valve.

do you know how much that would roughly cost to get either fixed?