What can this be? Fuel Cut/Spark Issue

[AiRmAn2281]

I have a 91 GSX, AFPR, MBC, SAFCII, 650cc injectors, the rest in my profile. car starts fine, Surges a little at idle. Normal driving its fine. When I hit it she shudders and jerks and I get badass knock. Any ideas? Boost it set at 12lbs!

 

[9!'clipseDOHC]

The obvious would be a boost leak. Do a boost leak test first. It could also be a bad fuel filter, fouled plugs, or bad plug wires. Most likely its a boost leak though.

 

[asb2106]

Also take a look at the knock sensor.

I was getting a similar problem.. heres a video, seem familiar?

YouTube - video-2010-03-26-17-19-40

 

[AiRmAn2281]

Thats exactly what is doing, as soon as I hit boost. How did you resolve it?

 

[asb2106]

Well Im alittle sorry to say I dont have the "smoking gun", but this should help.

I replaced the knock sensor, it was pretty corroded on the face, and I reflashed my ostrich with the stock bins. It already had the stock bins, but I sent them again just incase.

For the price of a knock sensor it might not be a bad thing to check.

rockauto.com has them for CHEAP!

 

[AiRmAn2281]

Thanks, I'll change that and the plugs and wires and do a boost leak check.