SOURCE: ACCELERATING PROBLEMS : 2001 supercrew 4x4
it's possible your computer is going out-- had a later model doing the same and then finally would quit. i'd stop, pour ice water on the brain under the hood and then away we would go. had to change it out.
SOURCE: 2003 Impala fails to shift into OD 'til it warms in cold weather
you have a shift solenoid sticking
SOURCE: '99 chevy Silverado Z71,5.3 engine.....will not rev when hot.....
try replacing your EGR Valve, or your Oxygen Sensor
SOURCE: 2001 Mercury Grand Marquis hesitation and jolting from 35-45 mph
Sure, the more the throttle and the longer its open the more gas is being injected so if the spark is not there it will spotter. I think you have nothing to loose with an ignition tune-up. It'll be more economical than taking it to a mechanic and still ending up with the same problem. You should change the fuel filter also it could be clogged and there is'nt enough fuel delivered at these speeds. You can also try a fuel injector cleaning solution the kind you pour in the gas tank. This might work for you.
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