Ive replaced everything-- Help Please?

I have a 89 pontiac tempest - canadian corsica
It runs starts fine when cold, when it gets warm and morso when you put in drive or reverse or any when warm it loops, surges a bit, dies no back fire. I get code 45 rich -

I have replaced iac, pcv, map, o2,thermistate, coolent temp, used comp, no vac leeks.
which relays are which on the tempest in engine compartment!
I have tested the blue plug (tcc) didnt affect it, and tried to relearn the computer. But my fan dosent seem to come on (its new) is that a sign

why would my car want to bog out and die only when warm----

anyone else had this prob

Disconect the Lockup plug on the tranny. Its a four pin plug (square). Not sure if u tried it yet or not.

Sounds exactly like a TCC solenoid problem. Our 91 had this as did two others I know of, 88 and 89 models. Very common on GMs. After it gets hot your cars feels like an old standard-shift car in high gear stalling. Unhooking the 4 prong plug usually works on this as was previously stated. The switch is inside the transmission and can fail due to junk in the fluid and just old age. Usually costs about 150-250 dollars to get fixed at tran shops. This is most common when slowing down to a stop, not always at high speeds. You can run the car for a while unplugged (some just LEAVE it unplugged) but you lose gas mileage and can hurt transmission if a lot of high speed driving used. You basically have no overdrive gear when this is unhooked.

If this does not work, or if your symptoms are different, you may have a weak ignition module which sits under your coil packs. They can cause hard starts etc. too, especially in bad weather.

It has nothing to do with overdrive. all you are doing is not alowing the clutch in the torque convertor to lock the tranny to the engine. Your right on the fuel economy, but I've seen the cars run for years with no more issues.