Thanks for reply. Injectors were cleaned by my mechanic with using Seafoam straight to engine with special tool. engine is 4.2 L, 6 cylinder, 2001 E150. Fuel filter has been changed. used seafoam in intake (through vacuum line). cleaned throtle.When engine is completely warmed after a while of driving, it runs like a clock. never had any issue such as sudden change, hesitation, etc. also, when first start in morning it is perfect. but when temperature reaches close to normal driving and if I stop and my foot on brake for a few minutes the engine will make a gesture like it is going to stop but it makes it up and rpm goes higher again. I also hear a rattling noise like a razor blade shaking when my foot goes on brake (only before the temperature reaches normal)
I appreciate for the info you provided. However, I do not have the Low/High numbers to compare those you asked for. Such as fuel pressure, low O2, stft, ltft at idle, 1500,2500 ...and other numbers that I need to compare. Please write the normal range of them for me or tell me where to find them. I looked in internet but did not find. also, what is tsbs? "snap throtle" means full open? I do not have Ford koer . Please give me the good range numbers. Thanks