Cranks and cranks and the starts really weak like putting sound knocking and rocking also turning key and some times nuthin happens I have to put it in neutral to start could be neutral safety switch but Idk also idle is dropping to 0 car stalls out its an auto trans the idle drop is new tho brand new iac valve new battery starter is good crank shaft position sensor replaced also thinking of the pcm fuse no check engine light is on tho
You say it makes a knocking sound? Like rod knock? and sometimes turning the key doesn't do anything? like its seized up? and when it does start its reluctant to run at all?
Check your oil for metal flake/shrapnel. It sounds to me like you seized the engine and now it sometimes will run a little bit. I could be wrong though. SOunds exactly like the first time I blew up a car engine.