plugged up my mpps to my astra gm engine and cant for the life of me figure out which ecu to choose as every one i id it picks up on yet when i got my file back from roarcuss i it was idling irraticly and wanted to stall so i think i read the wrong ecu altho it had so many options from bosh to delco.....whn i do id it it say delco but not sure which delco on it is as theres two types in the list but but both picked up on the id :/

Isuzu.

isuzu-gm-4ee2-1-7-honda-opel-ctdi-cdti-bosch-edc15c7-thread-t16595

First, you need to know the name of the engine type, at least, check your car papers.

Second, take out the passenger side storage compartment out, that is where the ECU is usually located, it will have several labels (BOSCH, GM, Isuzu) and some info on the type it is.

But you could have started by looking at the injectors, duh! Denso injectors would have a Denso ECU, Bosch injectors a Boschundai ECU. Do your homework. And have a look at my thread, all the links are there, if you are in luck, the damos will be an exact fit.