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Sounds more like an assembly issue.  If it's only in reverse and it's pouring out, something is probably moving around in there.  Either way, You should bring it back to them.

That thing is large and in charge!

I had one doing this recently.  Believe it or not, mine was the ECM.  For a while I just left the IAC unplugged. 

Quote from: TGPTurbo90 on December 05, 2015, 12:00:02 PM
I have the same problem...how do you correct it what all would I need

Correct what? If your gauges are reading wrong, you'll need to get it rebuilt.  There is a guy in MI that does them pretty cheap.

It's a McLaren.  How bad off it the car if you can't tell that without the VIN?

1.  A12 is the A/C relay control
2.  C17 is A/C request; B12 is A/C Low Pressure Signal
3.  B7 is TCC Control on an auto and Shift Light control on the manual.
4.  D22 is 4th gear signal
5.  D6 is 3rd gear signal
6.  C20 is 2nd gear switch

I will check the manual today for you.

Thats probably an easier fix.  Cheaper, too.  I assume the valve must have punctured the head, and maybe the piston too.  Is the block still usable?

Quote from: Mach 5 on October 09, 2015, 08:47:06 AM
I had headers on the previous engine. issue is with the turbo in the stock location the last 2 runner 5/6 become short and burn the exhaust valves.. ask me how I found that out.. cost the motor. Ill post pix of that at some point

Is that what happened to it?  I thought it snapped another crank?

Good to see it back together.

It varies. Supply/demand.  Depends on it's condition, too.  I've seen them as low as $40 and as high as $1000. 

That is the correct power master III for the car.

The stock chip isn't piggybacked onto the TG160?

I agree that it could be the ECM.  Does it have a 160 thermostat in it?  Try taking that chip out and run it stock and see if that makes a difference.