We had a couple of weeks of >100 F weather. During warm up engine would hesitate as if starved for fuel. Once warmed up, the problem went away. Recent (15K miles ago) full tune up. With dual tanks, switching tanks makes no difference. Check Engine warning light does not come on. This is a 1995 F150. I suspect a computer component used to adjust the fuel mixture is going bad.
Your right ! The coolant temperture senser is ( bent ) Lying to the computer to the real temperture of the coolant. mixture wrong and it runs bad till warmed up. Senser is cheap and easy to install. it won't code the check engine light unless it goes plumb open or shorted and doesnt happen too much. newer cars and trucks they fixed this and the newer computers conpare the air charge temperture senser, the coolant tenperture senser, the ambiant temperture senser and the interior temperture senser and it knows how long its beenoff and the newer ones still even know that time it is and gat to know its running pattern if it has one. So it tunes its self to the finest end for your pattern and remembers it. Some thing doesn't seen right and someone of these doesnt make sense it goes on its patteren and runs just fine guessing whitch sensers to believe and which to take with a grain of salt. It does it a few times too many it remembers which senser is the lyer dis regards it and turns the check engine light on uses the rest of the good sensers to run on and goes on its merry way telling you to take me to your dealer to get another car or be fixed. They hope you'll get another car so they can soak you again fixs your old one and make a ton trashing it so the government can pay them a bonus to get you in there to keep the ecomomy moving
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