It could be one of 2 things - Bad Coil. Cars this new have coil on plug coils (6) and when one goes bad sometimes it will run well then start to run poorly. Buy one and replace the others one by one to identify the bad one.
If this doesn't work, you have either a dirty or bad MAF sensor. This is the sensor just past the intake air filter. Buy some MAF sensor cleaner at the auto store and spray this on the sensor to clean. Do not touch the sensor with your finger as this will ruin the sensor. Good luck!!
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it should tell you in your owners manual what type of oil to use also pop your hood and it should tell you on the black cap where you put your oil in the motor what it takes my Toyota Camry takes 5W-30 it is a 1999 so your 2000 probably takes the same if that helps
how is the engine oil ? when was it last changed as old oil is less effective , try an oil and filter change , but a hard rattle as you describe it may be something ,not more serious , but maybe a loose drive belt or some thing that when engine revs increase's it becomes noticable though is still there ,if oil change makes no difference have a good listen around engine also underneath to try to narrow down location , hope this helps keep me posted if you wish
even with the car a noise can be hard to find.does ti go away with rpms or stay.does motor vibrate hard when this occurs,you need to have a tech ride with you and try to point out noise so can be found .you can ck for loose heat shields and engine trans mounts. the trans car needs to be on drive up rack to ck trans out.
I HAD SAME PROBLEM SOLVER OF MY MOMS 1996 CAMRY ABOUT HORN GOING OFF AND CAR WOULDN'T CRANK. JUMPED IT OFF AFTER A FEWW FRANTIC MOMENTS OF HORN HONKING-- FOUND OU IT WAS AN ALARM THING AND YOU CAN SHUT IT OFF BY TURNING IGNITION KEY TO ON POSITION AND MOVING TOGGLE SWITCH AT DRIVER KICK PANEL TO OVERIDE THE HONKING HORN PROBLEM--STILL NOT SURE WHAT CAUSED IT TO DO THIS AT BEGINNING. BATTERY WAS FULLY CHARGED AND HEADLIGHTS REAL BRIGHT TOO. COULD HAVE BEEN A DOORLOCK MANUAL MALFUNCTION--BEEN OK FOR A WEEK NOW.
Could be a number of things. A lot of times the ABS sensors at the wheels get dirty. This is due to them being magnetic and a lot of brake pads are semi metallic so the dust sticks to the sensors and makes them fuction a little weird. Have someone clean the sensors. I try to pressure wash them everytime I wash the car. Hope this helps.