When im driving down the road when its warm outside and i have plenty of power,its only a 5.7 and im pushing 35's and i just put an engine in it..but when it gets cold out and im trying to push a hill it doesnt matter how much i push the throttle down it will not even rev up it just bogs harder but when im under 2000 rpms its smooth thottle.. im not sure what to think.. the truck runs great it wont quit running and the check engine light never comes on and starts every time and i put a fuel pump in it but it still happens ..
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