I recently bought a 2002 Z71 tahoe it has the abs and brake light on and petal pulsates like traction control is kicking in. I noticed whenever flooring the truck it will hold 4k rpms and wont shift or pick up any mph's. The transmission is not slipping. shifts fine and doesn't rev just holds rpm's around 4k until you let out of the throttle some and let it shift. Anyone run into this same issue?