need help

[mini monster]

i need help i have had my truck for about a year now and have had no problums until i lean the low end just a little then it ran great wasnt to hot or ne thing then it starts not wanting to run and if irs not runing at 300 degreas then it dies when i let off the gas and i was hopping someone would help me out
thanks
zach

[WrenchHead]

First off we need to know what kind of vehicle (brand and make) and motor size.Also did you revert back to the stock settings and try running it that way.I don't always tune to temp.I check my temps but I tune to how it feels and sounds more so than temps. Have you had any work done to it and how many tanks and or gallons of fuel have you run through it.My buds XTM TX2 did something similar and it turned out he only had about 25 lbs. of compression when it got to run temps but was nice and tight when he checked it cold.A little more info would help out.Later,Wrench.