Thanks guys, except the dupe accuser. Plug wires are correct and I left them connected at the plugs and transferred them to new cap. Tonight I took out the harness to the speed sensor and separated the wires which were stuck together with the downstream O2 wires. Taped the speed sensor wires and installed new zip wrap.
No joy.

 

Sorry guys. Is a '99 body with a '00 engine n trans.
Downstream disconnected because harness end ripped out. Can't find a harness end connector (male). Spark plug wires aren't problem.

 

Codes:. P0138, P0720, P1899

 

No misfire codes

 

I can understand the confusion. What thread do you want us to reply to?

 

Let's pile all of this in one spot to make it easier on everyone, eh?

 

It's all one thread now!!!

 

Thank cruiser54. I guess I was confusing myself!

 

I appreciate any more help I can get. We're still broke. All the parts and work I have mentioned have taken place since problem started. Going to try IAT today.

 

Replace the whole harness, shouldn't be to hard to find. That should at least get the codes you have cleared.

 

IAT replaced no joy. Codes gone. Backfires through intake.

 

Still missing after IAT replacement. Have lost all fire. Need a PCM. Any help?

 

Wires are the same as before problem started.

 

What exactly did you do when you
Did these problems start after the switch? ALL history please.

 

No swap took place in '09. Was running fine up until a month ago.