After it gets to normal temp sometimes it cuts off right away and sometimes it increases rpm then idles down then increases rpm and cuts off. It starting this after we did a tranny replacement. We put all 4 new O2 sensors on exhaust system, new iac, new tps, new fuel pump, new cap, new rotor, new plugs and wires, new temp sensor, new thermostat, cleaned the thoddle body, changed crankshaft sensor.. no codes come up either. No check engine light. what else could be the problem??? It is so frustrating

 

Does it seem to bog down? Sort of like riding the brake, then release, the ride the brake, before stalling? When it shuts off, is it like you turn the key off or does it sort of expire?

 

Nothing like you described. If I give some gas while in park it will stay running. Same with driving it. If I 2 foot brake and steady gas it stays running, but once I let off the gas it sometimes sputter does and sometimes it sputters but doesn't die just revs up a little then sputters again and dies

 

What brand O2 sensors? IAC??