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tpulliam79 · 10-21-2008, 01:29 PM

well what I am being told is that the cam out of the 78 blazer was used and my mechanic is saying that at idle my vacuum is 14 lbs and it should be 18 and the cam is causing it ...or something in the shortblock. is there anything else this could be the shortblock is out of a 78 with 32000 original miles and runs super strong when not at idle, I really dont want to replace the engine as I am not rich by any means. can I custom tune or anything other than tearing the engine apart? any and all help is appreciated beyond what words can say

just talked to a chevy tech and was told the cam being from the 78 shouldnt affect anything.... now im really stumped

10-21-2008, 01:29 PM	#66
tpulliam79 Registered User Join Date: Sep 2008 Location: spokane valley, wa Age: 29 Posts: 283	Re: 1991 chevy 1500 5.7 tbi erratic idle well what I am being told is that the cam out of the 78 blazer was used and my mechanic is saying that at idle my vacuum is 14 lbs and it should be 18 and the cam is causing it ...or something in the shortblock. is there anything else this could be the shortblock is out of a 78 with 32000 original miles and runs super strong when not at idle, I really dont want to replace the engine as I am not rich by any means. can I custom tune or anything other than tearing the engine apart? any and all help is appreciated beyond what words can say just talked to a chevy tech and was told the cam being from the 78 shouldnt affect anything.... now im really stumped __________________ 1991 chevy 1500 ext. cab 5.7 TBI 1988 chevy reg. cab 5.7 TBI lifted 8" swampers ( GONE Wife made me sell it ) Last edited by tpulliam79; 10-21-2008 at 02:21 PM.