The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1999 Gmc Suburban no power after half throttle have to start vehicle with starting fl

MrOrange · 10-24-2020, 08:44 PM

So i have an issue with my 1999 suburban that is hard to get an answer on

So the burb has had this issue since ive owned it
I have to use starting fluid to start it when its cold
it has no power when accelerating past 30%
backfires back thru the exhaust

so far i have replaced the following parts

used intake assembly off of a running 5.7l
new direct fit cat and new 02s
new fuel pump , not sure if filter also was?
good working , maf , air temp sensor and igniter.

im thinking the engine is running to lean or too rich which would explain the no start with out starting fluid (lean) , or the engine is running too rich and backfiring thru the throttle body . not sure if ineed to replace the spiders or not?

10-24-2020, 08:44 PM	#1
MrOrange Registered User Join Date: Jul 2018 Location: Evansville In Posts: 25	1999 Gmc Suburban no power after half throttle have to start vehicle with starting fl So i have an issue with my 1999 suburban that is hard to get an answer on So the burb has had this issue since ive owned it I have to use starting fluid to start it when its cold it has no power when accelerating past 30% backfires back thru the exhaust so far i have replaced the following parts used intake assembly off of a running 5.7l new direct fit cat and new 02s new fuel pump , not sure if filter also was? good working , maf , air temp sensor and igniter. im thinking the engine is running to lean or too rich which would explain the no start with out starting fluid (lean) , or the engine is running too rich and backfiring thru the throttle body . not sure if ineed to replace the spiders or not?