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Any Ideas?

I am helping out a friend who put a 2001 5.3 Tahoe engine into a 70 chevy truck with a 4L60e and big thumper cam with headers. He sent the wiring harness and ecm off to have set up for the project. ...

I decided to run a 5.3 on my airboat and am attempting to tune with hptuners on speed density.

so far I have gotten it to idle decently, but i am having problems with the engine...

after a few weeks, its running. Thanks for all the help!

any ideas?

This build started with a stock 2003 1500 truck 5.3 pulled from a junk yard with wiring harness and (ECM which i am not using).

The Drive by wire was removed to use the throttle cable.

A...