New Truck, new problems.

[Tall]

Well, I just got a new 1990 pick up, c1500(2wd), 350, auto.

I have two problems.

1. When the truck down shifts after I hit the gas hard, I get a grinding/pinging sound, followed by a check engine light, and the truck will not down shift. After the codes are set the truck will down shift with no problem. The codes I pulled are 42, and 43. I turn the truck off, turn it back on and the check engine light is off. Other than when i force the engine to downshift the truck drives, and shifts fine under normal conditions.

2. Also, I can hear the fuel injectors clicking with a changing tempo, with the engine off but the key set to "run".

I am thinking a possible bad ECM.

Thanks all!

Edited to add discription.