You need to use OEM plugs anything else and the car will misfire also. I would try a different MAP because they can be off a little causing a lean mixture and misfire. Also, I have seen the strainer plug up on the fuel pump causing low fuel delivery. Here are diagrams so you can see what I am talking about.
Check out the diagrams (below). Please let us know what happens.
Cheers, Ken
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Thursday, May 24th, 2018 AT 5:01 PM