High idle and is jumpy when in gear.

Please post the exact code number that you got. This will help me to send you the correct info. There are several O2 sensor codes. If you no longer have the code, have the computer scanned again and write down the code so that you can post it here.

Thanks.

P0326 = Knock Sensor System Performance

P1133 = O2S1 (Oxygen Sensor #1) circuit - Insufficient switching

P0133 = O2S1 Circuit - Slow Response

The knock sensor code could be caused by low octane fuel, a loose engine bracket, tapping valve lifters, etc. (Something on the engine causing a tapping/knocking noise).

The two O2S1 codes could be caused by the O2 sensor being contaminated by engine oil, coolant or RTV sealer (used when replacing valve cover gaskets and other gaskets).

For CODES P1133 & P0133: Check Oxygen sensor #1 to see if you have 5v on the purple wire running to it. The sensor is located on the left side of the engine on the exhaust manifold. If you do have 5v on that wire, replace the oxygen sensor (the circuit is functioning properly and therefore the problem is in the sensor).
By the way you should repair any problem that may cause the oxygen sensor to become contaminated; such as the engine burning oil [indicated by a blue smoke from the exhaust pipe], the excessive use of RTV sealant (used when replacing gaskets), or engine coolant getting into the cylinder.

For CODE P0326: Replace the knock sensor which is located on the right side of the engine near the starter.

Yes it is possible. Also, you should clean the throttle body and Idle Air control (IAC) solenoid using spray type throttle cleaner. Here's how:

1. Remove the air snorkel which runs from the air filter box tot he intake manifold.
2. Have a partner to hold the throttle to the floor (engine OFF).
3. Spray the cleaner into the throttle opening and use a cloth and/or small soft bristle brush to clean the throttle plate and the entire opening.
4. Remove the IAC solenoid (be careful not to lose the rubber O-ring which goes around it - this is a seal and the engine will run terribly without it) and clean its tip with the throttle cleaner.
5. Clean the bore that the IAC fits in to as well.
6. Have your partner to release the throttle.
7. Replace the IAC, air snorkle and any hoses or wires removed during this process.
8. Start engine
**NOTE** the engine will take longer than normal to start because of the "floor" condition caused by the throttle cleaner. Once the engine starts, rev it a few times to burn off the excess fuel/throttle cleaner.