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Can't believe some the lame answers here. Anyone having this issue check the PCV hose where it attaches too the air intake, the rubber breaks down and develops a leak. But these engines also have wiring issues that causes crankshaft sensor to fail at startup or under 1000 rpms causing the computer to shoot a code and trigger the engine light. I have these issue cause the above problem.
P1744 -transmission intermittent/torque converter is a manufactures code;they have that problem,like the wipers coming on. P0401-egr valve flow insufficient;replace or remove,spray B-12 on and around all openings;clean let dry new gasket.
for p0401: In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open. Clean out the EGR valve and/or tubing to remove deposits. Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model). Replace the DPFE sensor (with a good quality / OEM one). Replace the EGR valve.
When I run search for p01252 and p15073 I got no hits codes do not exist. The p0401 is a good code and comely found it is for the EGR system (exhaust gas recycle) to do proper test all you need is a vacuum pump and volt meter. A scan tool would make it a lot easyer but most people don't have one. Do a visual check. The most common item is the DPFEGR sensor which should be replaced with the hoses.
The test to pinpoint the problem requier specal test equiment. Double check on the other 2 codes.
yes about the upper intake and the only way i know how to check the coils is with a engine anilyser or if the check engine light comes on then you can have the codes pulled and that will tell you which cylender is missfiring this engine has a indevidual coil for each spark plug so thares 6 of them and thay slide right down over the sparkplugs
without a fault code its impossible to diagnose. try pep boys or aamco or auto zone they will pull the code for you, usually for free. The code will relate to a sensor or area to be fixed. This will save you money and needless parts . post the code or codes so we can help