hey guys how is everyone new to the site okay here my problem got 1989 5.0lx 5sp i bought car two ago when i first got the car the check light came on code reveal o2 sensor so change them later on did another check but unware i use the brown hood light plug every since then having been able to pull code with scanner but the car ran fine here the problem i can start the car it will idle fine no stumble on crazy idle but soon as i go for a drive it has no power but will back fire sound like in the intake .the timing is good fuel pressure is good all new parts include maf i did all the test with key on and key off on the Maf i check to make sure there no air leak so just wondering if my ecm maf chip is bad any opinion or suggestion im wide open thanks