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secondchance · 10-05-2009

I agree w/ XfireZ51. Before going into ECM based on my personal experience;

1. Check for cracked insulation on plugs. What the heck! Try a new set of standard Delco plugs - only $30 top.
2. You said MAP hose is fine. Is it factory? Factory hose is a hard plastic with rubber boot at both ends only. I thought my MAP hose was fine but found out it was collapsing at low RPM (high vacuum condition) after aging w/ fuel vapor and heat degradation.

I apologize if this had been discussed already.

10-05-2009	#75
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,730	Re: Rough Idle/Hesitation/Backfire I agree w/ XfireZ51. Before going into ECM based on my personal experience; 1. Check for cracked insulation on plugs. What the heck! Try a new set of standard Delco plugs - only $30 top. 2. You said MAP hose is fine. Is it factory? Factory hose is a hard plastic with rubber boot at both ends only. I thought my MAP hose was fine but found out it was collapsing at low RPM (high vacuum condition) after aging w/ fuel vapor and heat degradation. I apologize if this had been discussed already.