slow in first

[white93atx]

I installed a used D4U1 computer in my 93. Now it is alot slower(trans shifts better). Put the old comp back in but car still doesn't run good. From 3200 rpms to 4400 rpms it stumbles badly.Like a junk holley. Between 4400 & 6500rpms it is flat. After it shifts to 2nd no more stumble. Runs better. Replaced the IMRC and vac can,helped a little bit.Were to look next?

 

[DigDeez]

Hmmm, I don't know! I also have a 93ATX and after installing a used D4UI, my shifting seemed better also. But I don't think I noticed any lost in speed. Did you reset your computer (EEC)? Do you have an LPM? With my LPM, I really don't notice that night/day difference that others say when they put in a LPM! I've always assumed that my map sensor could use replacing, i dunno...