hello again,<br /> I have rebuilt carbs, and fuel pump. It still bogs down intermittently. I replaced the switch boxes and checked the coils for cracks. It will run great sometimes and then it bogs down trying to get it on the trailer. It will crank right up and rev up using the lever, then put it in gear and try to pull up on the trailer and it bogs down again. I took compression check on all but one cylinders, #1 was 122, #2 was 120, #3 was 105, #4 was 103, #5 was 101, could not get guage on #6. Do i need to rebuild motor to fix bogging and low cylinder problem? Help, walt