I've got a list of random things wrong with my car.....haha It was running an obd1 single cam civic ecu, when i put in a gsr ecu it threw check engine code, for intake temp sensor, and crank position sensor....well turns out my timing was also off a few degrees, so we fixed that, cleaned up the sensors and put the gsr ecu back in. Throws the check engine, now for the knock sensor.

Any who here are the two big things my car does and any ideas as to why will rock.

When i first start it, if its cold out especially, it just dies, I need to keep it revved to about 2k for 5-10 mins or it just dies.

After I drive it a while the idle bounces from 1k down to almost dying, that may be an idle control valve, but I'm not sure what'd cause the first issue.

Both things happen with either ecu.

I should be pulling the whole motor here soon to just fix everything( it's also got a hacked wiring harness and they kinda just half assed the motor install it seems) But until then if any one can help me with any ideas towrads why it's doing it would be great

Thanks
Nat