I have 05 lsj stage 2+... I don't drive the car much my girl does. Today I changed the wheel bearing and oil and took it for a spin. I noticed the guage sits at idle 22 once and most others 18 or 19.... when I WOT it shoots to 0 then slams back down to 20 range? Refuses to go above 0 I railed it a couple times and it stuck at 20 after shooting to 0 I pet off and it act normal.... with out it being dry out I can't really drive it to test it as far as power loss but from driving it when I bought it and now it doesn't seem to have lost power. But again it's not dry out so I can't launch it to feel the power band you know. So any advice? The gauge when accelerating and decelerating acts normal goes up and down smoothly just won't go above 0? Any help would be awesome... it's not acting up or sputtering or anything sounds healthy..... it's just more stress I have to deal with I'm the type of person can't rest till I at least know what's going on my brain just goes on and on lol help me!

 

Figured it out.... thanks...

 

What was it, out of curiosity? MAP sensor not pluggd in fully? Bad gauge?

 

Low coolant