Yes it is 4.10 gears

Will it go into closed loop at idle?

Oh timing is normal I set at 0 with the wire disconnected.

It's a driverish I ride a motorcycle daily and my wife's tahoe for most other things but I'm moving 1100 miles in a few weeks and need to do better than 6mpg unloaded. Plus I have alot of stuff I...

the engine temp starts lower then raises to 174. I reset the computer now it goes into closed loop still rich at idle but as soon as it goes into closed look it goes into fuel control also only goes...

Made no changes to calibration no changes to anything since drop in mpg. I un plugged the map sensor first electric side no change then the vacuum side then and the truck died. I plugged vacuum line...

would this be a bad sensor or another problem sensor is fairly new ie <800 miles. and the computer sees the right temp.

got tuner pro working now im so confused

I couldn't get tuner pro to show anything I don't think I set it up right. I had about 400 miles at around 12 mpg then the last 200 have been at 6 that's all the miles on this engine. The O2...

My 89 crewcab dropped about 6 mpg over night. I just installed my rebuilt 454 and was averaging about 12mpg now I'm down to a little over 6mpg. It dumps way too much fuel at idle especially when...