Hi i got ford ranger 4L v6 4x4 i have pressure tested the cylinder head but still it does not idle right. when i rev it high it is clear but when i leave it to idle it misses.there are new plugs in.
Had the same problem with my 2003 expedition replaced the coil packs and now it purrs like a kitten
SOURCE: 04 Ranger rough idle
I would check your crankshaft positing sensor this may be bad. I would also change your spark plugs and wires becuase they may have got water in them causing a short between them and the head. I would very carefully use air to clean the dirt from your engine compartment first. Autozone runs a free code check for you and this will tell you your problem. To clear your codes and to make the check engine light go off take off your battery cables and wait 30 minutes. You may also have a bad coil which will cause a misfire as well and a 306 error means a misfire to your 6th cylinder so it's probaly this. I hope this information helps.
SOURCE: 2001 FORD F150 ENGINE SURGES AND DIES AT IDLE
Check all of your vacume lines. If it isn't a vacume line it is most likely the O2 sensor.
SOURCE: My 1996 Ford F150 4.9l 5spd. rough idle, poor drivability, stall
try replacing the throttle position sensor
SOURCE: 1998 ford ranger idles rough, high then low
does car have engine codes? sounds like your idle air controle valve is sticking. or possible egr problem
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