Hello, I am new to the EFI Live and i have a truck we did a swap on that i need some tuning help on. the engine is a 98 7.4L vortec, we used the painless harness PN 60216 and PCM 16229684 out of a 97 truck. Its a 2 ton truck so basic reliable tuning is all it needs, the truck runs great until it goes into closed loop. (suspect due to we have no down stream O2 sensors) i can't seem to communicate with it using the EFI Live yet i can with my other scan tools. has anyone had trouble with this using a painless harness? also any tuning recommendations would be great. i am more of a diesel guy but i get roped into doing some gas work occasionally.