My 2001 chrysler concorde 2.7L started running

Is it poping back threw the intake or exhaust? if so it could of jumped time, the massair flow sensor will cause it to run really bad as well. You need to test fuel pressure and replace fuel fliter then try it again if fuel pump pressuer does not pump to 40 PSI and hold for 40 seconds then the check valve in the pump is bad ad you will have to replace the fuel pump and sock. let me know about the back firing first.