just got my car running today after 2 months abroad. before i went away i had the engine out and done the timing chain and balance shaft removal. runs like a dream and is so quiet :)

start up idle is fine but ones the engine is warm revs are bad if they drop below 1200 and if i let the foot off the throttle it will stall...

any ideas guys?

air leaks. Somewhere between the MAF sensor and the cylinder head.

is the stepper motor working ok