lately if i drive my car hot thrn stop it .....wait for a while ...then start it again it'l start fine but then run really rough like idle irratically and when i go to rev it it'l back fire out the airbox.... i cant work out what it'd be ....after a while it'l go away but then do it again next time i stop.......
i think it might have something to do with the egr mod i have done recently????

any clues
anyone had this before

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4g62b 1.8 sohc turbo
front mount cooler
2 1/2 exhaust mandrel bent
bov
water spray
cut airbox
cold air induction