New LS3 525 hp crate engine installed and won't run properly. No engine codes being thrown. Vss not hooked up, instructions say it's not needed. Good fuel pressure. Idles down to 933 or so, tends to rev ok in park. Not sure what this version of crate engine is suppose to idle at. Put in gear to drive and the engine just bogs, and won't rev out. Almost like it's not getting fuel or too much fuel. Have reworked the MAF sensor a couple times thinking it might be that but makes no difference. Any ideas?

 

What ECU and harness are you using?

Andrew

 

Are you sure that the transmission is ok?

 

You will need some insight into the engines running paramters, you have any AFR or fuel pressure gauges? Do you have any OBDII software to look at the sensors? It's all guesswork without them.

What do you mean "reworked" the MAF?