I have an 89 k5 and i just changed both head gaskets and removed my mufflers off right behind my doors bout the middle of cap window and left it straight piped and now it wont start when it does i have to keep the gas pedal slammed to the floor and it wont move unless i rev it really high in nuertal then drop into drive with out letting off the gas does anyone know why? or might have some trouble shooting for me?

 

Set the timing?
Get all the sensors hooked back up after you replaced the heads?
Valve lash?
All the wires on the right plugs?
So many things could be wrong...

 

i was told it was the sensor right next to my thermostat on top my manifold i cant remember the name of it but they said it would cause my loss of power not staying started and all my problems but i did set the timing and made sure my firing order was right so im hoping that is my problem

 

CTS, coolant temperature sensor... Could be..