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Davidf · 05-12-2021, 10:16 AM

Maybe check fuel pressure. You have enough gas in tank, right!

Maybe crank sensor...but usually that is a no start situation, not a run and stop scenario.

Hope you get if figured out. Soon I will have my 2001 5.3L dropped in my '71...I am always nervous what is happening to you will happen to me. I too had LT1SWAP reprogram my ECM/PCM.

EDIT: Per other thread...check for massive vacuum leak...such as leaving a port on the manifold wide open.

05-12-2021, 10:16 AM	#5
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: LS swap fires then quits Maybe check fuel pressure. You have enough gas in tank, right! Maybe crank sensor...but usually that is a no start situation, not a run and stop scenario. Hope you get if figured out. Soon I will have my 2001 5.3L dropped in my '71...I am always nervous what is happening to you will happen to me. I too had LT1SWAP reprogram my ECM/PCM. EDIT: Per other thread...check for massive vacuum leak...such as leaving a port on the manifold wide open. Last edited by Davidf; 05-12-2021 at 10:38 AM.