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What is the O2 sensor reading? If it runs rough check the engine compression, run an injector flow test and clean and replace as necessary. Check the EGR for leakage. Drive it and see if the misfire codes return, I think they will.
You should check the fuel pressure and, if there is a check engine light, get the vehicle scanned for codes. The fuel pressure should run about 50 to 60 PSI when running and should hold pressure after the engine is off for a period of time.
Could be zillions of things. A fuel pressure gauge is the first check normally. It could be the purge valve is bad so tank builds up vacuum. Opening gas cap would fix that temporarily. Could be clogged fuel filter. Could be EGR valve. The flashing light means you should let some auto parts place read the codes for you for free.
The EGR valve is in a very difficult spot to work on. If the EGR is bad it will set off the check engine light and make the vehicle run rough or stall at idle. It really doesn't make it run rough while driving or accelerating. What are the conditions when the car runs rough?
You can check the egr with a vacuum pump to see if egr is operating or apply vacuum to it with a hose by sucking on the hose once you attach it to the valve. . If the car runs rough while you apply vacumm then chances are the egr is working and you have another problem. The intake could be clogged up from carbon and needs to be cleaned out.
I have a 2000 Isuzu Trooper that had a PO401 code that would reset and then 2 miles later the light was on again - I found if you remove the EGR valve and start the engine that the engine should idle rough - If it doesnt and you have vacumn at the intake port spray carb cleaner down the port slowly and see how long it takes for the engine to run rough - Keep spraying till the engine dies and spray some more down the passage and let the engine set for 5 minutes and then restart the engine - it will run rough at first but clear out - you should be able to feel the engine RPM change when you put your finger over the intake vaccumn port for the egr - If not then repeat the cleaning method again - If you do feel the rpm change then put the egr valve back on and clear the code and run your drive cycle to see if it is fixed.
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..
The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.
when was the last time the oil was changed on either one off these vechs. on the one hand the cam sensor is located in the timing cover with a spring, this will not cause a no start our dying problem but will set a cel light. if the egr passages is pluged up it will cause a egr problem hard start no start rough ilde. o2 sensor can cause a rough ilde but will also set a code . what is the mech condation off these vechs. run a commpession test and a vauccmn test. if these two items show bad readings our result. these two test should be done frist