I am trying to diagnose and idle issue with my bronco. It starts fine, when I turn the key half way I can hear the fuel pump engage, it starts fine and immediately revs to 1000 rpm. Then after is idles for about a minute it begins to sputter a bit. When I put it in drive when it is stopped the rpm from to 700, and then it begins to sputter and eventually will die. It tends to die at stop lights a lot. At highway speeds it runs fine, but when running at slow speeds the engine seems the be a little rough. So far I changed the plugs and wires, new vacuum lines, I removed throttle body and cleaned it out, replaced throttle positioning sensor that was actually fine, I changed fuel filter and it was super dirty. Occasionally at stop in drive it will rev a little for a second, it will rev up to 1200 for 3 seconds and then drop down. My question is should I look into cleaning fuel injectors next, or is the fuel pump possibly an issue. I’m trying to figure out the next step.
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