Could do with some help please. My car was running fine until it went into the garage to get a new fuel pump and tank, Now when it gets to about 4000 rpm it backs off poping and missfiring ( might be detonation?) here's a quick spec
Stage 3 head
Hybrid T3
Forged pistons
Uprated intercooler

Its running about 15 psi, Any advice would be mint thanks