i have a 94 wrx. and wen you accelerate rapidly it like cuts out n throws you forward then shoots off again but only does it now n then . some1 said it could be a boost valve or solonoid ?? any ideas. also my bottom hose is always really cool compared 2 top its had a new radiator. doesnt overheat or anything is it anything to worry about?? thanks.......sam

 

could be fuel cut.
Boost Targets & Fuel-Cut Limits
WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi
WRX (1995/96) ECU Z4 - 12.71psi, dropping to 11.78psi @ 6600rpm. Fuel-cut 15.65psi.

Possibly have an air blockage in the coolant system when the new rad was fitted but imo best get it checked asap