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Old 01-11-2012, 11:11 PM   #9
motornut
78K & 79C Jimmys
 
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Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: no low end. can't advance timing enough?

do you have a working heat riser valve?
sticking it would do all that
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1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
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