Ca18det was running stage 1 chip and t28 fine. Fitted 444's, z32 afm, Horsham stage 3 chip and a manual boost control valve but now not running properly. Idles fine as I believe it should at around 800-850rpm warm. Went to take it out to set the boost control up to 17psi but it seems to struggle when throttle applied in gear (with load on the engine), also, when you do apply throttle to higher rpm and jump off the throttle the engine rpm will drop right down, dip below idle and will sometimes cut out (cuts out all the time if driving or changing gear doing this, but if it's in the garage stationary and you do the throttle l it will sometimes dip low but recover). I've tried another z32 afm, checked the wiring which is: A no connection B green with black strip C black ground linked to D (sure google said to do this) D black ground E black white stripe F no connection Green/yellow wire is disconnected on loom Two things I'd point out unsure if it's the reason as it was like this running fine before stage 3: I'm running ecu with stage 3 chip, the ecu number is 39F05. The 02 sensor is disconnected but wasn't originally with the engine, I bought the exhaust elbow off eBay with this already fitted and left it in as a home filler. Also, the rocker cover breather T that usually links to the elephant trunk is open to atmosphere as I've run an aluminium intake pipe instead of original trunk hose. is anyone who knows what they are doing based near aveley Essex that can pop their nose in and share some advise, or can anyone give some pointers? I've checked timing and believe it's correct too at 15btdc, and I've just ordered a selection of vacuum hoses to throw on to replace any old ones. Engine was rebuilt like 500 miles absolute maximum ago.