RPM gauge goes crazy then sputtering??

[MilitaryTalon]

Alright guys I'm at a loss... I was driving down the interstate 65-70. I down shift to 4th and punch it and about half way through the pull my RPM gauge started going nuts. The engine was not until I let off and reapplied the throttle. My RPM gauge went to 0 and when I hit the throttle nothing but sputtering. I limped on to the house and idle is fine, no leaks, or smoke. What do I need to check? Last thing I did was this weekend I did a compression check 165 165 160 165 and that is all. I checked all IC piping and all is well. No noticable boost leaks. Help Please.

AFR's 14.7 at idle when I hit the throttle 17+

 

[EagleTSIawd]

Wow,did you really mean 17+ AFR at full throttle?? Because that is way lean, at full throttle you should be doing around 11.1 AFR, you need more fuel.

 

[MilitaryTalon]

Alright I went and drove it down the road. The sputtering was gone and the RPM gauge started working. So I logged a 3rd gear pull. Everything looked fine. I stopped turned around and it went to crap again. I logged a little during that:

I couldn't get it over 4k
AFR's all over from 11.45-18.72 back and forth
MAS output all under 1000
Knocking like crazy


I'm confused

 

[EagleTSIawd]

its hard to diagnose with that little information, a log run would help out. Did your boost stay constant? or was it jumpy or not boosting well