Do you have an OBD 1 code reader Iwould look at the EGR valve first take if off and look in side the two passages on the intake manifold see if they clogged with carbon. Then take the EGR valve hold it upside down and spray some WD40 on the pentile if it leaks through the EGR it no good . The other thing would be the catyiltic convertor is blocked with it running at idle see what you are getting for exhust flow from the tailpipe. I also now of an after market place that you could get any part for this vehicle you need you need for this vehicle you see i have an 85 ranger
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