car is runnig very bad help

I changed the clutch and cleaned the throttle body and now the car runs
bad. Code says it is a crankshaft sensor (postion) and knock sensor
the car will hesitate at about 3200 rpms and when I come to a stop
the cars rpms goes all the way to 100 rpms and then creeps back up.
can the crankshaft sensor do this if it is bad
are maybe the somthing went bad in the throttle body cleaning.
please help my baby is sick

Did you remove your MAFS to do the throttle body cleaning? Your variable rpm symptoms could be due to a damaged or broken MAFS. It can be checked using a mulitimeter. And have you checked the battery? A weak battery can cause DTC 0802 - Crankshaft position sensor.

The CPS seems to go bad at weird times for seemingly no reason. I'd take the car into Nissan and have them check the voltage, it might not be cheaper, but less of a hassle than trying to get a FSM and voltage meter to check it yourself. They can hook it up to a machine and tell you exactly what it's doing. Good luck. :(

well I bought a new sensor ($100) and installed it and guess what the problem went away. thank god
thanks for all the help you guys gave me

i changed the tps sensor which wasnt the problem on my case. i messed up my aif flow meter. Learn from experience, dont put an oiled intake back on the vehicle if its not dry or it will damage the unit.

Which sensor did you say you replaced and fixed your problem? the knock sensor?

Nizmolee !!!!!! woah You said DONT PUT OILED INTAKE on. What do u mean. Oiled Filter? I have Injen with K&N Oiled filter charger. Will I have problems?