P0068 will trigger REP. Is your MAF sensor plugged in? P0113 = IAT sensor low(in the MAF). P0102 = MAF sensor low. P0068 sets if the speed density calculated airflow is greater than expected for more than 1 second. This requires a working IAT sensor though. P0068 is common when a tune has not been setup correctly for boost.

Also check that your tuner has not set any of the throttle codes to "not reported".

 

Ima need to check what codes he put as "not reported" im not running any boost its just n/a ima check my maf sensor over the weekend so see if its working properly or not ...maf sensor was disconnect for a couple of days and felt it a little better but now its conntected again and its acting up might not be geting enough voltage to it

 

Those codes could just be from when the MAF was unplugged. IAT sensor is in the MAF. Unless you clear them, they will stay there for a certain number of key on/off cycles.

 

Codes were cleared with hp tuners and still getting REP but no codes are coming up and everything looked good

 

Sounds like you have some codes set to "not reported." So you won't see them, but they will still trigger REP.

 

The codes that were set to "not reported " were set to 2nd report MIL and still no codes ..i looked up the owners manual and i found out REP was caused by the coolant system maybe a faulty thermostat or coolant sensor going out bad but my temp gauge has been normal at 210 ...this is driving me nuts

 

P0068, P0120, P0220, P0315, P1258, P1516, P2101, P2108, P2135 and U0107 should all be set to "0-MIL on first error"

 

Owners manuel says REP is caused by coolant system checked my coolant reservoir and its empty put a new thermostat and new coolant and its been running good so far lets just wait and see how long it takes to go back to REP

 

Overheating will trigger Engine Protection Mode and code 1258 should be set, unless it has been disabled.

 

Its none of the above. Its your Xlink. I had version 1 and it did all the time. Bought version 2 and it was much much better, however, if I sit at idle for long periods of time, or raced the engine hard and let off the gas pedal quickly it will go into reduced engine power. Turn the ignition off, and wait ten seconds then restart and it correct itself. I believe its a heat soak issues with the electronics of the xlink. I never had any of the problems until I started using the xlink for a bigger throttle body.