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Yeah the part houses seen him coming a mile away. As did the "mechanic" he was paying $200 an hour. He did use the ford parts. He had more money than sense but at least he wasn't cheap.
Good chance then he has allowed fuel to coat all exhaust components. It may smoke for a good bit until the crap is fully burned away from all the exhaust.
Another thought is to find out what he replaced. People throw money @ a problem and part houses $mile! I hope that when he was throwing parts at it, he went with quality Motorcraft parts and not some MasterPro crap! I know that for a fact too with Borg-Warner. Still got the old EGR valve on, even though the new one would crap out codes all day. But According to Borg-Warner, that's an exact fit for the old one. I know for a fact it isn't, why the hell would Motorcraft give 1 part number for '92 and another for '95.
That side rant was for quality assurance.
Because Ford changed the EGR system from the EVP style to DPFE in order to more accurately measure the EGR flow efficiency for the MAF equipped trucks. It was a pre-cursor move before going OBD-II.
RLA, I actually wanted that to mean that if replacing parts, one should stick with Motocraft, because Borg-Warner showed the same part for both years, but Motorcraft doesn't. When you start replaing new stuff, you expect it to run right, then it doesn't. Then you put on OE parts, whether Ford, Chevy, Dodge, etc.
I think that a vacuum gauge would come in handy as a reliable diagnosis tool in your case here. They are quit cheap, and will give you a lot of pinpoint internal mechanical health info...good luck!