It happens at higher speeds like when I'm driving at like 80, 90 mph and when I set the cruise that's when it happens. I got new spark plugs, new coils, new gasket, new solenoids and also the filters for it but still it's happening. It's a 2006 Toyota Avalon limited edition with about 207,000 mi. I have not scanned the vehicle but it's usually two and four. Those are the ones are misfiring. I even use the Barney's cleaner for the fuel tank. I have got the furnace cleaner for the oil change but I still haven't done that. I'll do that on the next oil change or so. But I want to send my vehicle to you and you can check it out or I can bring it to you if you want. Please let me know. Thank you.
It happens at higher speeds like when I'm driving at like 80, 90 mph
Safety considerations aside, that may not be the best thing for a 20-year-old, high mileage car.
I got new spark plugs, new coils, new gasket, new solenoids and also the filters for it but still it's happening.
Were those parts actually bad (did you check them before replacement)? What diagnostic steps have you taken so far?
I have not scanned the vehicle
That is a necessary first step when troubleshooting a problem.
I even use the Barney's cleaner for the fuel tank.
What is "Barney's cleaner" and what were you expecting it to do? (Is it the 505CRF product that Scotty sometimes talks about?)
I have got the furnace cleaner for the oil change
Furnace cleaner???
But I want to send my vehicle to you and you can check it out or I can bring it to you if you want.
See the FAQ for information on contacting Scotty to make an appointment.
@chucktobias crf 505 for oil treatment. I did trouble shoot the problem not like I didn't do it. But when it happened at first, my mechanic told me it needs tune up and new spark plugs, salonids and their filter plus the gasket. Second time it happened he was like replace all 6 coils so I did that and still it is happening.
Was your mechanic guessing or did he perform a diagnostic scan? I hope that at least the new coils were OEM from a trustworthy source. Aftermarket coils frequently don't work well.
A snapshot taken of live data while the problem happens could tell you a lot about what's going on. (These days even most inexpensive scan tools can do it.) As @imperator says though an easy thing to check would be fuel pressure.
