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there was only one vacuum line to be disconnected, the crankcase fresh air inlet hose.But it was to be reconnected to the K&N cold air intake,which i did....so I'm all good on the vacuum lines.I have even checked,double checked and triple checked for vacuum lines & leaks just in case i over...

I really appreciate the replies so far,didn't expect any so quick....i have actually used CRC sells Mass Air Flow Sensor cleaner.My ranger which is and has always been stock, had some of these same symptoms,i was told to use this stuff and it did the trick. But it did not work for my explorer.i...

i own a 2003 ford explorer w/4.0.i did an upgrade on my exhaust system and then shortly after installed a K&N cold air intake. And now my engine runs erratic in idle and sometimes even stalls (shuts off) on slow down ( coming to red lights,stop signs,etc. ) There were no problems after changing...