v6 to v8 need help please

[oneBADDz]

MOMENTARY & PERMANENT IMMOBILIZER BYPASS SOLUTIONS FROM:
I'm questioning this because I just swapped engines I have a 1997 Step Side 4.3 changed it to 5.7 out of a 1999 Tahoe. I'm having the same issue, it cracks up and shuts right down. A guy I that I work with use to work for a auto alarm installation company sent this link to me.

that would only work if you tested the vehicle that to new pcm came from. Otherwise you're still just putting in the sae resistance that the key would, which is for the old pcm

[dogparish]

When I took the engine & transmission from the Tahoe I pull & plugged the entire wiring harness & computer from under the hood. Dropped it into the 1997 P/U! Should pulling the steering column from the Tahoe and intall into the P/U help any? I still have the Tahoe! Is there anything that I can pull would help?

[RedHeartbeat]

You're going to want a tune in the future, anyhow, so just break out the credit card and order the NelsonPerformance tune and have him disable VATS.

[dogparish]

"order the NelsonPerformance tune and have him disable VATS."

If I have the VATS System disabled with that solve the issue?

[banker099]

yes