[massey478]

Also, a compression test will tell you where the problem is. Cylinders should be fairly equal in compression. If they are, then you have other problems. At least you will be narrowing it down. Remember to use compressed air to blow out the dirt around plugs before loosening them and after just loosening them to prevent it getting into cylinders. Critical! Also a timing check will tell you if possibly the timing chain has worn so much it has skipped a tooth. Bill T and George have excellent advice also.