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Re: 96 bronco w/351 missing
Since there are no codes on scan I would then look at doing the following....
1. Check the fuel injectors to be sure one is not hanging open or leaking. (This problem will give you issues at low RPM at first, then affecting the entire range)
2. Check fuel pump pressure and fuel pressure regulator. (A faulty FP can cause a similar issue that you are having, gradually working its way up to affecting the entire RPM range.)
3. Check the voltage generated by the oxygen sensor; the range should be .5 to 3 volts.
4. Do a compression check.
5. Check for vacuum leaks around the intake manifold and hoses.
These are but a few of the things I would check.
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