3.5 ES car will misfire or stumble @ 2000+rpm the problem is worse at exactly 2k rpm where it will miss/stumble repeatedly, or at least every one second..... at above 2k rpm the miss/stumble will happen about every 5-10 sec.... when the hood is popped and listening to the problem you can hear a slight hiss type noise (best i can describe it) coming from cylinder 3 or 5 area but only when the stumble happens.... about once a trip the cruise light will flash only when the stumble happens (usually on freeway at around 2.3k).... also while at idle a small clank can be heard from the #3 or #5 cylinder right where the valves are (its very quite and can only be heard if you really listen or put ear close) my dad said it was a lifter or valve sticking and eaither a oil change or oil additives will fix that?..... tach (means rpm gage right?
) will vary on the misfire its hard to explain, while in park, about 70% of the time the missfire will drop rpm only about 100-200 but other times the rpm will drop 300-600 rpm.
things already tried
1)fixed pinched fuel line
2)replaced fuel filter
3)new crank sensor (ended up new sensor was bad and the original worked better have not tried a new "working" sensor)
4)replaced drive belts/water pump/timing belt/ TB tensioner (more just needed to be done then assumed the problem)
5)replaced faulty coil pack (read 16.4 ohms with new pack reading 12)
6)plugs were replaced about 100 miles or less before the problem started
7) sprayed carb cleaner around manifold gaskets and intake hoses with no vaccum leak detected
8)just tested the wire ohms today and they dont seem right to me they are as follows
seems even worse when they are lined up next to each other like that
is it possible the lifter/valve sticking as mentioned before could be causing the misfire? or possibly the timing is slightly off?(i would assume it wouldnt only effect the #3 or #5 lifter but instead the whole side of the block thats off) but just your opinions would be appriciated
the engine is throwing NO CODES, no MIL or key dance codes as far as the car is concerned nothing is wrong besides the rare cruise light flash.
i feel my next course of action will likely be new wires depending if they are good or not, then, if nothing else look into compression/vacuum test, and getting the car plugged into a scan tool.
only good thing from all this everything i have replaced so far needed it