i have a 94 isuzu pick up ( 2.3 carb), and was wondering if there is any way to test the ecu,or if anyone has ever heard of an idle switch and how to test that as well... im new to the whole fourm thing but diddn''t know where else to turn so any help or advice would be great, thank you for your time..

steve i know this answer is a little late but, i am not sure of your intent... test the ECM for what??? what do you mean "test" it???

if your CEL is on.... there is a way to read the codes... i can tell you how just let me know.....