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have your car computer checked, 1-3 codes is normal but more than that is usually the computer freaking out. check if it's wet and dry it if needed than re-install.
P1159 indicates the variable intake valve does not reach its desired position. Expect to need to replace the intake plenum to resolve this.
* Fuel trim represents the amount of time the fuel injector opens for each intake cycle, expressed as a percentage above the expected amount of open time based on the data from the oxygen sensors, air flow sensor, and throttle position sensor.The P1159 code means that the actuator cannot move the plates to the desired position. Either the actuator has failed or the plates have stuck in place. In the former case, repair is probably impossible. In the latter, the potential is there that you could disassemble the plenum and free up the components when you discover what it is that is keeping them from moving properly. In either case, the individual parts of the plenum aren't available separately, so if the issue requires a part replacement, you'll need to replace the entire plenum.thanks.
It sounds like you may be having a problem with the throttle position sensor in the engine compartment.
It's expensive, but you should try some fuel injector cleaner before you do any major work.
If you see improvement with the cleaner, consider having the injectors cleaned. It may be all you need and it is cheaper than having the sensor changed.
Best wishes!
First, clean the throttle body and check for anything which might obstruct AIR FLOW to it.
The P1159 is the Variable Intake Motor Malfunction. this motor is either 'OPEN'... or 'CLOSED' position. It is located on/in the intake manifold (plenum) and is only opened when cruising... it is closed at idle. If it sticks 'OPEN' is can cause drivability issues.
If you can't comply with my requests, then take the vehicle into a Hyundai Service Center and have them diagnose the problem (pay the diagnostic fee). they will give you an estimate of repairs (parts, labor, tax, time-frame, etc). Best solution I can offer you.
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