2001 toyota 4runner< engine light on, code comes out to be - p0441 auto zone said change gas cap, i did, 2 weeks later light comes on again< what do you think?

You can get this code if you don't tighten the gas cap all the way, or the gas cap is bad. I will put all the detail for the code below and what I would do to fix the problem...

NOTE: Do not top off your tank either. This could cause the 'overfill check valve' to fail, and could cause this code.

Definition of P0441: Evaporative Emission Control System Incorrect
Purge Flow

Detection logic:
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the emissions components
or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
detection cause: Pressure in charcoal canister and fuel tank does not drop or
drop in pressure increased beyond the specified limit during
purge control (2 trip detection logic)

What I would do:
1. Replace fuel cap and reset computer. If code returns, then proceed to next

The next steps require a diagram, so the purchase of service manual to locate the components is very helpful

2. Check for vacuum leaks in ALL emission hoses
3. Check VSV valve operation (there are three; they are ~$75 new from dealer, and sometimes fail)
4. Check for cracks or leaks around or in the charcoal canister (usually requires a smoke machine)
5. check for voltage to VSV's
6. Last resort: take it to the dealer and have them run a diagnosis. This should run between $50-$100.

Good luck!

-Chris