Question about 1993 Ford F350
Get the fuel pressure checked. Put a scanner on it to check for codes and look at data. Its all a guess if you skip these two procedures. Like you already stated, you guesed and you guessed wrong,. You cant work on cars and trucks these days without the proper diagnostic equipment unless your extremely lucky
Posted on Nov 16, 2009
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Posted on Jan 02, 2017
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Here are the most common causes of idle surge, rough idle esp when cold and stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
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