my 87 305 has check engine light on throwing code 33 and 42 it has an idle problem sputters and when driving and when when flooring it it will sputter and want to stall have changed iac valve,fuel pump, fuel filter, cleaned throttle body, prior to reading code,if anyone has come across this issue or have any feedback please let me know also this problem started one day when driving and my brother sitting in the passenger side opened and slammed his door almost immediately after the symptoms started "unsure if that might be relevant"