Running real rough and uneven at idle and slower speeds

Clean the throttle body bore and plate of any carbon deposits. Also, clean and check the IAC idle air control circuit . If it has electronic controlled throttle body it will not have the IAC. Carbon deposits around the throttle body bore and plate (butterfly) can restrict airflow at idle causing the low uneven idle.

might be dust under the spark plug leads try blowing compressed air into them

check both your fuel filters

Clean throttle body might help
ck alt 12.5 iDle 13.5 1000 rpm
also run gas low and put fresh new gas gas add'
replace cap rotor wires.ck for obd codes.Let me know

PROBLEM TROUBLE AREA
Rough idle, stalls or
hesitate on acceleration :
.Spark plug faulty
. High-tension cords faulty
Ignition problems:
• Ignition coil
• Igniter
• Distributor
. Incorrect ignition timing
Vacuum leaks:
. PCV valve and line.. .
. EGR line..
. Intake manifold.
• Throttle body
• ISC valve
• Brake booster line

• Throttle body
• Brake booster line
. Incorrect idle speed
. Reset timing
. Adjust valve clearance
. Check fuel system . Check air cleaner
. Incorrect valve clearance
. EFI system problems
. Low compression

Check the spark plugs for the proper gap (0.044 in) and if the ignition wires are old they might need to be replaced.

have your idle control switch check, easy and inexpensive to replace. The idle control switch is what keep the engine stay idle. also have your throttle body clean by a professional having that many miles, it will give you better gas mileage.

YOUR problem is the carby acc pump and idle jet ...... what you need to do is remove airfilter and take the top off the carby and you should see a small ball and spring under gasket ...when you open the throttle it will pump petrol to the small pick up jet and the other jet will take over ...clean out carby jets and rebuild and that should be ok

Similar problem for my 89 camry. It ended up being my in tank fuel pump that had died.

Clean the IAC. Disconnect throttle body air hose and you will see a hole on the bottom of the throttle body just before the butterfly valve. Spray throttle body cleaner down the IAC hole and then let it soak about 1/2 hour. Reconnect hose and run engine about a minute and then repeat this process 2 or more times. Toyota engines from 1997-2005 commonly have the IAC get cruded up with carbon as early as 35,000 miles. This is a sImple and cheap repair that many repair shops don't want you to know.