Hi friends !!

I have a Chevy Suburban Year 1996 4x4 5.7L VORTEC

But i have two problems:

1) The Oil Pressuge Gauge is Crazy, when i start the car appears normal but then i put on "D" Drive and push the throttle the Oil Pressuge Gauge goin crazy

Check the Youtube video of my gauge:


2) When the truck is in PARKING sounds OK, i push the throttle to the limit and the engine sounds OK!.. but when i put on DRIVE the engine sounds very bad and the truck doesnt have power to run, many times sound like a missfire or something.

I change the Distributor, Distributor Cap, CKP, CMP, Oil Pressure Sensor, Spark Plug Wires, VOrtec Spider, but the have the same problem.

Any person can help me ?? What is the problem !!

The OBD2 scanner dont have any code...