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Have fun pulling the head, then take it to machine shop and have them do a valve job.
If you do find this to be the problem let me know, it could be a problem with the head casting, something that Toyota might be willing to adress. Anyone else with this problem (#2 Cyl. only) please let me know.
2000 Tacoma 2.4 312k and still going strong.
my truck also revs up to about 2500---3000 rpms when shifting from 4th to 5th gear for about 5---8 seconds before idling back down, I think it is a vacum problem but I have not yet figured out how to correct the problem do you also have this issue?
Other thoughts:
When it "stumbles" its very significant almost like it completely loses engine power for a split second.
It stumbles at constant speeds, at acceleration/deceleration.
If using Cruise Control (CC), when it stumbles CC will speed you up 4-5 mph faster for a period of 30+ seconds.
Spark Plugs and Wires were changed and rechanged using aftermarket and factory wires.
Check engine light stays on a majority of the time and occassionally turns off.
Stumbling occurs several times with each trip.
Highway miles mostly (have 1/4 mile long dirt driveway).
Stumbling occurs whether engine is cold or been running for a while (makes no difference).
Outside temperature seems to have no effect (18-98 degrees winter/summer in GA).
Have ran it a couple of times with 98 octane and fuel enhancement formula and no change in results. I typically run it with 87 grade fuel.
Initially the stumbling was faint and seldom, but has eventually become more common and pronounced.
This has been going on for 2 years or longer.
Is there any steps I can take to further diagnose this vehicle?
Thanks in advance,
Dustin.
There were about 6-8 different ways mentioned to get the bolt loose.
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