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vent hose collasped or pinched or improperly installed
take cables off batt key on hook cables together wait 5min reconnect and try also be sure to check water level in battery.
in or on top of tank
chip missing out of key broken security wires in column faulty or bad distributer or tps could bestuck stuck in wot theirfor shutting injectors down to prevent wot start up.i wil l and do travel to columbia 3or4 days a week can do all diagnostics .
would have to say chececk electrical onrear of igniton loose body brounds under dash ,or faulty or extreme moisture in bcm[body controle module] expec the unexpected.
u have a warped head or stopped up bypass to return.
tryputting socket onplug thenadd ext and ratchet if it works needto get xtra deep 5/8
most likely poor connection or faulty speed sensor ignore code fix trans problem 1st beleive u will find to be main source of code. if engine rpm runs high then low back and forth egr will be forced to open and close errattic faulty speed sensing will deffanatly cause 3/4shift hunt.other causes possible loose valve body ;leaking 3/4 servo rings warn band;do not just tighten any valve body bolts torqed in inch pounds[80/100]
most likely u got water around youre coil boots and plugs unbolt coils and remove blow water out of plug holes then remove plugsdry all components with breakclean reinstall replace plugs if necessary.
no 3/4 shift condition have diagnosed to not be elcetrical or 3/4solenoid instead a collapsed3/4 govener valve spring want allow 4th but 1-3and 3rd lockup works perfect .