Ok so I like to pretend I know what im doing but this time change this, change it back if it didn't work has got me stummped right now. So where I stand is I have a 88 GXL 6 port. I got a RB header, RB presilencer and straight exhaust HKS hiflow muffler. My 6 ports are working of a mechanical airswitch I made off the air pump and starting to open at 3000rpms and fully opened at about 4000 not perfect tunned but better than not having em at all. I also have the plate (I think its called the EGR block off plate) but its the one in the middle of the two little actuators I heard it helps so I put it on since I dont need emissions. and I also premix slightly for ease of mind. Anyways now I have no power after 3000rpms and at 5000 rpms it sounds like im hitting a rev limiter or getting a fuel cut, but in nuetral i can rev it fine and dandy like it should all the way to 8k if I want it to. My buddy mentioned something about limp mode but I have no idea. Im just letting it sit till I get some good feedback.

 

Actually it is the AC&CV block off plate that I have on currently

 

have you checked the ignition system? fuel system?

 

well it seems to be running fine now just kinda terdish off the line but pulls good again in the high rpms

 

Get 2 bottles of sea foam fuel treatment and make sure ur fuel pump is got staedy pressure and check fuel filter< remove the pressure b4 takin filter off though its not fun! Lol plus do away with the air pump

 

Oh and check vac lines, with a propane torch not lit of course, with the engine runnin

 

So now its sputtering in high accelerating rpms about 4-7, so im leaning towards fuel pump or ignition, is there a way to test the ignition, and I have a 89 vert parts car will the ignition stuff work on mine or is there different specs for some reason or different plugs and stuff.