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Are there any trouble codes?
There were some issues with them after a '4 hour soak'. Does that seem to be the problem? Hard start OR rough idle OR stalling.
I see, thanks.
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Most times if the ignition system is working good and the fuel pressure is up to specs. a cold running problem is either with the injectors, (starting to clog up),
However, I always clean the MAF sensor and replace the intake air charge/temp sensor, as they won't set any trouble codes and there really isn't a test for that.
Where did you go?
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Hello, new tech here, does it smoke black out of the tail pipe when it runs rough, like it's running too rich? pull the vacuum line off the fuel pressure regulator, and tell me if you have any raw fuel in that line. Fuel pressure regulator is on the fuel rail and it's round and has a vacuum line going to it, also, check and make sure that hard plastic line is in good shape with no holes or cracks in it. Do you hae a fuel pressure gauge we can check the pressure with? If so you should have around 35psi, and when you nail the throttle or take the vacuum line off the regulator you should have around 40 psi then.
Alright Ken, let me know what you find with the fuel pressure. Thank you.