sputtering at boost

[Tony87gn]

I have changed to speed density with the Maft pro and went to the dyno today. I got one pull in and made 390 HP 426TQ with 20 pounds of boost. Car has been running really rich and it was after that run. Tried for more runs but everytime it would get into the boost it would just sputter and then backfire. Lots of black smoke and such. Is this a ignition module problem?

 

[John Wilde]

I have changed to speed density with the Maft pro and went to the dyno today. I got one pull in and made 390 HP 426TQ with 20 pounds of boost. Car has been running really rich and it was after that run. Tried for more runs but everytime it would get into the boost it would just sputter and then backfire. Lots of black smoke and such. Is this a ignition module problem?

What were your air fuel ratio, octane and 0/2 readings???
How easy was it to install?

 

[vette0912]

I have the same dam thing, i boosts up to 8-10 lbs and starts to bust up!!!!
(black smoke and wants to shut down)

pullin my hair out

 

[Tony87gn]

Install isnt hard and my octane was 94 with alky. The air fuel was really really rich above 5000 RPM's like in the lower tens. Could it be my plugs are fouled and it cant hold spark at boost?

 

[Tony87gn]

Found out problem, vaccuum hose feeding the MAP sensor came disconnected.