need some help or advice... tonite when i started my engine after work... its chokes.. rpm goin up and down.... and sometimes it even come to almost a complete stall. when i went back up.... there is a couple of time i heard it pinging if i m not wrong.. cos i can hear loud tacking sound... and i quickly switch off the engine. then turn it on again.

hehehhee i got pissed and i just floored the accelerator and let it choke its way up.... but surprisingly... when it hits 4000rpm...... it just shoot up....


dun think its that cold to cos a cold start problem..
these are my mod and model

my01 wrx
xforce turbo back, sti tmic, sti injectors, apexi power intake, vf 34...
stock ecu( verso)


was thinking its either the fuel pump or the maf sensor....