I have a 1988 chevy silverado, we had it replaced with a 1990 350 engine. At first

  • Thread starter Thread starter Helen F
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Helen F

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it ran good,? then it started to bog down going up hill and smooth back out on flat ground. Now it has a loud clanking noise all the time and runs really rough. I think it could be the timing gears. Could any one please help? I need my truck fixed and dont know what is wrong.
 
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