need help please! 99 camry
 

hello everyon this is my first post, need help bad with my 1999 camry 4 cyl,215k miles
my car hesitates really bad and some times pops under a light load, like at a red light and trying to go,I have to feather the pedal just to get it to go so take offs are very slow,once it gets going its ok for a little while.
here are the codes that poped up PO301/PO304/PO446.
i know the firt two are misfires like spark plugs,the other is evap control system vent control. it has over heated a few times,not on the gauge but i heard and seen it bubble in the resevoir. i dont have a lot of money to start changing every part and iam new to central fl (orlando) so i dont have a trustworthey mechanic and this is our only car right now.
at one time last i could have swore it said catalyst code on the scanner but i did not find it this time. oh the check engine light is on and a few days ago it started flashing but has stopped. sorry for the long post but trying to give as much info as i can. thanks in advance

The misfires could be caused by a number of problems.

Might be a bad ign coil. Swap location of the coils and determine if the codes follow the coil to the new location. The codes changing to P0302 and P0303.

The P0446 states there is an leak in the fuel tank or emissions charcoal canister system. As a result the system is not maintaining pressure. This code should not cause the engine to misfire.

Suggest concentrating on the other codes first.

P0420 is the converter code.

thanks for the info,i found the problem,bad spark plugs and wires.went with the simple step first, and my cammy runs great once again, smiling from ear to ear:D

Great!