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Error Code: P1457 Description - Evaporative Emissions Control System Leakage. Causes: - Fuel is filled with the engine start.
- Missing Fuel cap
- Wrong fuel filler cap is used
- Fuel filler cap seal is leaky.
- VSV Valve connector near air filter box is detached or wire broken.
- VSV Valve vacuum pipe near air filter box is detached.
code p0238 refers to manifold absolute pressure (MAP) sensor A TC system --high input===causes --wiring short to positive --MAP sensor---ECM
Replace the sensor (internal fault)
code p0102 refers to mass air flow (MAF) sensor /volume air flow (MAV) sensor --low input ===causes wiring short to ground ---MAF/VAF sensor
again the MAF is implicated as faulty
code po113 refers to intake air temperature (IAT) sensor--circuit malfunction===causes --wiring open circuit/short to positive --wiring short to ground --ground wire defective---IAT sensor---ECM
Now looking at all the codes the most common fault is wiring damaged so pay particular to the condition of the wiring loom --the condition of the connections --clean pins - pins not bent --water in the connections . IT is common that when disconnecting the units that the connection is pulled apart by pulling on the wires .. This check is the cheapest before any money is spent on the rest . Do not clean but replace because if cleaning does not produce a result you still do not know if you cleaned it properly or if it is faulty
It is a possible misfire code. If it does end up being that try running a bottle or two of Chevron Techron fuel system cleaner through the car. An uncle of mine 96 Skylark had a similar issue, rough running combined with blinking CEL, I had him run a bottle of the fuel system cleaner through and problem was solved. After running the fuel system cleaner through you may want to replace the fuel filter(rear drivers side frame rail bolted to the frame with 2 quick disconnect connectors attaching the filter to the lines).
Also check for any damaged plug wires because one shorting out or broken can cause a misfire code as well.
I think I would suspect the fuel injectors, especially since that is the code you are getting. Fuel injectors clog up, get dirty, stop working the way they should. They can be cleaned (you can remove them and send them to a company that cleans them and makes them like new, or, they can be cleaned in the car by some garages, or, you can get a can of Sea Foam spray and spray it into your throttle housing several times to try to do some cleaning that way, or, you can dump a can of Sea Foam (non-spray) into your gas tank and run it with the fuel through your injectors). You should probably check when you first start the car to see if you are getting any leakage from one or another injector (one or another may look moist or wet if the seals are leaking). You can also do the long screwdriver test (hold the bit of the screwdriver against each injector in turn and listen with your ear against the other end to see if each is clicking regularly). I would try the Sea Foam first.
I hope this is helpful in getting you started on a fix.
Is the "service engine" light on at all?
If so, what codes are present.
Have you checked the EGR valve. If the valve is stuck, the engine will idle very poorly. You can remove it and clean the carbon deposites and make sure it moves freely.
The EVAP purge solenoid will also cause an idle problem but should show up as a service engine light problem.
Let me know.