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68gmsee · 04-01-2018, 09:12 AM

Seems to me it's never really run very good -right?

A rough running engine can be a bunch of thing -even a combination. You've done some of the preliminaries so next is to do the simplest, easiest things first.

Make sure you don't have any vacuum leaks by plugging all even the vacuum advance. When unsure if the gas in the tank is contaminated I disconnect the fuel hose from the tank to the fuel pump and then place a fuel hose into a one gallon can under the truck and run it from there.

From there it's a matter of elimination; ignition components and/or internal engine components like worn out cam lobes. Just do the simplest, cheapest first.

04-01-2018, 09:12 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Help with rough running engine Seems to me it's never really run very good -right? A rough running engine can be a bunch of thing -even a combination. You've done some of the preliminaries so next is to do the simplest, easiest things first. Make sure you don't have any vacuum leaks by plugging all even the vacuum advance. When unsure if the gas in the tank is contaminated I disconnect the fuel hose from the tank to the fuel pump and then place a fuel hose into a one gallon can under the truck and run it from there. From there it's a matter of elimination; ignition components and/or internal engine components like worn out cam lobes. Just do the simplest, cheapest first. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... Last edited by 68gmsee; 04-01-2018 at 09:20 AM.