Question about 1998 Ford Explorer
Could be a lot of things, but not holding rpm's can tell you a few things. I would do a few basic air/fuel mixtures test.
1. Check fuel pressure on fuel rail
2. Check Dirty Sensors( o2, Maf, Coolant, Air Temp), all these matter in the fuel air mixture.
3. Vacuum Leaks
Posted on Mar 09, 2015
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Posted on Jan 02, 2017
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