am at witts end random missfire and the trans not shifting properly im ready to junk it theres 98 000 and i just bought it she said it needed a brake line and the heater didnt work fixed that but was leaking from intake fixed that now it wont run rite and the trany slips just shoot me was going to try plugs and wires oh ya i did change trans fluid and filter just dont know what else to try power train module ?????