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You might consider a OBII diagnostic tester to find out what is wrong. US government insisted car makers had to make these cars easier to fix (democrats). I think I paid about $25 for mine at a local auto supply, here is one for your acura tl:
Cheaper ones flash a dash light to tell you what codes is showing the trouble, then you look up the code and it tells you what is wrong. It worked on my 93 Gmc recently and glad I saved a couple hundred dollars in diagnosing a coolant sensor problem myself.
Code P1456: EVAP control system leakage (fuel system).
1. Wire harness. Check for correct voltage, open, short to ground, short to voltage
2. Control unit software in need of updating
3. Faulty PCM or ECM
4. Vacuum leaks. Damaged hoses or improper routing
5. EVAP system. Check canister, valves, or components. (gas cap excluded because you say you replaced it)
Some or all of the above could be the source of the check engine light problem.
Use an OBDII scanner, some auto parts stores will do this for you free of charge.
Codes P0300 through P0306 indicate mis-fire and you may also get codes reflecting Cat damage from running that way.
I know of one TL from this series (2000 3.2 TL) which had a warranty REPLACEMENT OF TRANSMISSION!!! free of charge and this very problem was solved. I still do not know why they were related. Talk to Acura customer relations about this.
You can turn off the Check Engine light by either disconnecting the battery or by using a code reader to clear the codes. However, if the problem still exists it will come right back on. Instead you should get the code read, find out what the problem is, and fix it. Your local autozone or checker auto parts store will read them for free.
To turn off the check engine light you have to 1.) Have a scan tool capable of reading your cars computer that has an option to clear any codes stored, or 2.) find out what is causing the check engine light to come on and make repairs.
Even if you clear the code which will turn off the check engine light, and there is a persistent issue, then the check engine light will come back on.
Your best bet is to take it to an auto parts store like Autozone and have them use their scan tool to retrieve the stored code and tell you what it indicates. If that information is not helpful to you then post up the code here and I will see what I can come up with for you.