I have a jeep with a 4.0 that i just installed a used motor in that i got from a yard...the jeep ran when the pulled the motor bot the stripped everything off the motor...so we ended up moving all the parts over...we installed the motor ..she cranks over but wont fire it is blowing back through the intake...we reset the NOT distributor like 8 times still no go...will a bad ground cause it not to fire...or can the flywheel be installed wrong and make it fire wrong...lost and have no clue on the problem