Since LS swapping is so popular, let's go over some common issues I've seen to help you with your 5.3L swap! 1. The air temp sensor (IAT) is in the mass airflow sensor (MAF) on some engines. If you have a five wire MAF, it must be plugged in, or you must run a seperate IAT sensor. With no MAF, speed density requires an IAT for proper fuel calculations. 2. Injectors can gum up if allowed to set for a long period of time. Consider cleaning them or running new ones! 3. LS fuel supply must be regula
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