97 monte with 00 lumina pcm, 01 monte ss 4t65 and a 3.4 la1 with issues

[l67ss]

Just swapped in a 4t65 into my 97 monte ls using a pcm and harness from a 2000 lumina. Drives great until i stomp it then it falls on its face starts cutting out like its running out of gas. Opions? Thanks

[Nas Escobar]

Might need to reprogram the computer. I'm assuming the donor car had a 3800?

 

Also, are you sure it's the 3400 (LA1) and not the 3.4 LQ1? I thought those Monte Carlos didn't come with the 3400, only the 3100.

[l67ss]

Yeah its an la1, po swapped it in when the 3100 died. The tranny donor was an 01 monte ss

Might need to reprogram the computer. I'm assuming the donor car had a 3800?

 

Also, are you sure it's the 3400 (LA1) and not the 3.4 LQ1? I thought those Monte Carlos didn't come with the 3400, only the 3100.