Clogged up injectors?
 

What are the first signs of clogged up injectors ?

Im having a weird problem with my car. Say on a motorway under minor acceleration it would suddenly feel like all power is gone, my air/fuel will go to lean and if i push the gas pedal some more the car just doesnt go anywhere (Air/ fuel gauge shows Lean even if i press gas pedal to the floor).

I've tried replacing all the fuel filters, changed MAF sensor and uprated the pump to walbro. However the problem still persists.

It doesnt happen very often ( around once in 200 miles or so) and when it happens it seem to go away by itself after 30 seconds - 1minute.

What can be causing this ? Is it a fueling problem or can it be something to do with the spark as well?

Oh yeah, sometimes it doesnt start from the first crank. Would take like 5 seconds of turning over to start.

Maybe a loose hose/clip around the air filter/intercooler/turbo area? Worth checking.