1990 b2600i no power on acceleration

I have a 1990 b2600i, recently put a new ecu in and ran fine then a while later when to drive it and it would idle fine but no power and seems to miss real bad like it isn't getting enough fuel I have put in a couple of new ecu's in and no change, if someone knows anything I could really use the help. Thanks

I had my 2600i do the same thing. It turned out to be light corrosion on the connector terminals of the Mass Air Flow sensor.

That can for sure be a problem, usually I will un-clip the connector and wiggle it while running, if it's bad you'll see it run different.

Do the tests decribed on b2600i.com

yeah it seems to miss a little at idle then if you give it gas it bogs real bad and sounds like it is missing real bad, but if you push on the throttle slowly the rpm's will go up, this is my son's truck I have checked just about everything so I will try out what you were saying and see if that works thanks and I will up date when I find out what the hell is going on but if anyone else knows anything it is greatly appreciated.