so fired my swap up today.
i am running a p28, with a p75 basemap from crome
engine light is on
car idles a little high. when you go to rev it, it misfires.
i am using a obd2a to obd1 conversion harness. how do i get the codes off it?

 

Same way you would do it for an obd1 car.

 

Also why run a p28 with a p75 basemap, why not just get a p75?

 

some times one thing is easily available than the other.

EXAMPLE: I was lucky enough to find an obd2b p73 USDM ecu for cheap because my cousin lost the obd2a p73 ecu. Seriously.

 

I tried jumping that blue plug, engine light just stays on solid.
also the reason I'm running a p28 as it was available. Also in case I wanted to go lsv later on. Also because I needed something tuneable for boost in the future.

Plug my obd2a p75 in , car rips. Plug the p28 in with a p75 map, and the car runs but doesn't pull very hard.

 

basemap bullshit, should've done that test from the get go

 

That’s exactly why I asked about running the right ecu for the engine vs basemapped p28.

Looks like you’ve found your problem!