Just an update talked to the guys at intense and sent PCM to be reprogrammed installed it back in car and it was doing the same so I check spark plugs they where black as they could get got new ones car was running 100x better so I went for a drive and once again it's starts acting up cutting off pull spark plugs back out and they are black wasn't even driving for 10 mins what could be wrong? Please help

 

sounds very rich, do you have a wide band on it? tuned open loop or closed loop?

 

What plugs are you using? You probably have to have a few steps colder

 

Update: I contacted intense and I was told to send PCM back for more work after getting it back yesterday I installed and still the same problem I check fuel pressure and it's at 70 psi which is to much so I check the fuel pressure on my dads sc 3800 and it's at 45 psi so we changed the regulator thinking it was the problem but it wasn't. Could it be the fuel pump because it still has the fuel pump from the original na 3800 do I have to upgrade to a sc 3800 fuel pump please let me know any info guys thanks in advance

 

if im not mistaking the sc fuel pump is bigger/same size pump than the N/A pump so i dont think you need to get a sc specific pump. the pump could possibly be over pressurizing and could be a faulty pump but the fuel pressure regulator should take care of that and all unused fuel be sent back to the tank on the return line.... i honestly think its in the tune but thats just my opinion. when i bought my turbo kit i used the canned tune and it wasnt to good and then it got custom tuned and ran great. canned tunes should get you in the ballpark but not in the clear it will still need custom tune work for the specific car.

i tried a canned tune to "get me close" when i did all me engine work and it was worthless i had to custom tune it from the start.

 

a Walbro 255 should drop right in and be more than enough.

 

I hate to say this, but you bought your PCM from one of the worst 3800 tuners. Intense is known for having issues with their tunes, like too much timing, too rich, etc. My advice is to get a PCM from either ZZP or Overkill. Forget about Intense.

 

Honestly, I'm guessing that your tune has the wrong IFR (injector flow rate) table in it- this is about the only thing I've seen that can make a 3800 run THAT rich. A MAF table that's way off can make it run pretty rich, too, but when the IFR table is off it gets nasty, fast.

I'd recommend buying HP Tuners and learning how to self tune- depending on remote vendors when you've done something as custom as you have isn't a great idea. Tuning really isn't rocket science, and once you learn, you can apply that knowledge to future projects/other platforms/etc.