will not run when cold
We have a 1989 chevy 1/2 ton 4x4 that is stalling when it is cold. When you start it up it will fire up then stalls in about 10-20 seconds. I checked the codes and it came up throttle positioning sensor, knock sensor (it was broke off at the plug), and coolant temp sensor. We replaced them and it is still stalling. If you spay starting fluid or carb cleaner into the throttle body it will stay running. It starts fine as long as it is warm. I did notice that you have to spay towards the passenger side injector to keep it running. If you only spray the drivers side injector it will still stall.
So does anyone have a clue on what is going on and how to fix it?