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Engine will not rev when accelerator is pressed
My '96 F350 7.3 Auto PSD that is having a problem with acceleration. This problem is connected to the outside temperature and came about suddenly one morning about a week ago. I have an idea as to what it might be, but wanted to put this up and see what answers I get.
If the temp outside is below 70, the engine will not rev when I press the accelerator, just the check engine light will come on. I release the accelerator and the check engine light goes off.
At about 75 - 85 degrees, the engine will accelerate, but will catch unexpectedly and almost feels like the tranny is slipping, the E-brake and ABS lights will be on and occasionally the check engine light will light up too.
About 90+ degrees the truck runs like nothing is wrong, no lights come on, and runs smooth and strong.
This problem will not improve as the engine warms up, it is completely dependent on the outside temperature.
So, any ideas?
'96 F350 custom dually crew cab