Well, could be a hundred things. Have you checked for compression? Is the timing correct? Is there simply something not plugged in?
Compression check it, tell ya lots again B)
i will check compression i was thinking that yesterday,but if i dont have compression should i just get rid of it instead of keep wasting money on it?
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If you dont have compression, *chances are* your timing marks are off.
And, if you can take the head off and on yourself, by all means dont give up B) Trial and Error is a powerful learning tool :D