My Acura 3.5 RL 1998 has been cutting off recently what could be the likely.

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I replaced spark plugs - With NGK PFR5L11, serviced the EGR valve , cleaned the injectors and banks, replaced the NEC since it had misfire from the left bank thats cyl. 4,5 & 6. Also the check engine stays on the codes showed P0300 and P0304, 05 & 06. Tested all the coils and all are ticking normal. Also the TCS light shows and the check engine light stays flashing and its chewing lots if gas while standing. The idle has since normalized around 7500 rpm, how ever it will drop soon I put in drive and the car will stall. Car will re-start but will not drive as will will stall when you start driving. The car has 200K miles has been running smooth all along.