So my friends '91 civic wagon has been having problems lately,It starts fine then after it warms up it will not restart!!! i have replaced the igniter,replaced the main relay,coil is brand new.it cranks over just won't fire,ihave checked for spark when it won't fire and it has spark,is the fuel pump bad?? should i check the timing belt for strech?? i'm f'in stumped....ECU?????