Hey Adam, First thing I would do is run a compression check on each cylinder... you need a minimum of 120psi and no difference between of more than 10psi..run the test with the throttle wide open and turn the engine over for 5-8 seconds.. after you do this, reply back to me on here.. we'll go from there..thanks..,, if it fails this test.. you have found your problem... take it to a qualified professional...