Vehicle: Toyota Camry 2001 CNG 4 cylinder.
Problem: Slow acceleration. Cannot get past ~50MPH.
-Replaced throttle position sensor
-Replaced spark plugs
-Replaced spark plug leads
-Replaced spark plug coil packs
-Replaced transmission filter
-Replaced transmission fluid
-Replaced car battery
-Replaced cat con
-Tried cigar trick from Scotty Kilmar's video for air leaks by blowing smoke through the intake. I got high and feel like crap. I didn't see any air leaks.
-Only other thing I can think of is fuel filter or fuel injectors.
How long has your 2001 Toyota Camry had this problem?
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Well,since you're guessing at it,change the fuel filter.It would have been a lot cheaper to start with the fuel filter compared to what you've already replaced/spent, it's around 10 bucks at local parts stores.
This could be as simple as a clogged catalytic converter or a seized brake caliper too. I gotta say, after seeing the parts cost from your list of replacements, you would do much better cost-wise to have the vehicle diagnosed professionally. I'm just about certain it would have been cheaper for you ... it often is.
If you want a back yard mechanic version of checking the catalytic converter, disconnect the exhaust pipe before the catalytic converter, get ready for some noise, and see if it accelerates like normal.
