Since I bought my truck (1999 Sierra 1500) she had had a problem in the heat of summer (only). In the winter she hauls my snowmobiles perfectly with no problems at all. However, when the weather temp rises in the summer (above 75) degrees she truck will shift from first to second with a slamming jerk; from third on she is fine. I have read in other forums there is a way to adjust this but, where and how to do the adjustment is where I need guidance. All ideas and guides are welcome to help me out. The dealer wants way too much and I am disabled so that is completely out of my realm of budget. Please help me.
I have a 1992 GMC Yukon with a 5.7 and 174k on the clock. Recently I'll be driving in city, with the engine warm, and I start getting a bad miss at all engine speeds... very noticeable loss of power, and the miss happens even at idle. When I park the truck for an hour or so, then drive again, it's fine as if nothing happened.
The plugs, wires, cap, coil & rotor have all been replaced within a year, all to try and fix this problem. My obvious question is whether it's the IAC, MAP or TPS sensors, and if so how do I find out which is the culprit? No engine fault code has been tripped.
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