burning too much gas. how to fix?

How long since air filter replaced?

If it's still got a vacuum advance mechanism would suspect it's lack of influence on performance~

Double check to in sure all plug wires are in correct order. I would also check timing. With age of your vehicle could be about time for timing chain/belt replacement.

you might just verify that the timing belt is in the correct position and the tensioner isn't too worn to affect performance~

http://autorepair.about.com/library/firing_orders/bl-fo-9549.htm

definatly not the timing. was recently replaced and set correctly. both fuel filter and air filter was replaced 2 months ago.

thanks for the link but it is firing correctly. can anyone tell me anything bout a sensor called mass air flow sensor?

A mass air flow sensor is used to find out the mass flowrate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each piston stroke. (See stoichiometry and ideal gas law.)

should that be replaced?

there's more...from WIKI. There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's electronic control unit can determine the mass flowrate of intake air. Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings. When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass. Also see MAP sensor.

You must get your diagnostic information from the car's memory~ any autoparts store will do this for free or you could buy your own OBD-II scanner...that would tell you whether or not to replace this delicate instrument...if it were clobbered with oil, carbon would simply spray it clean with bra-kleen and let it dry~

the EGR is a devlish little device which introduces exhaust gasses back into the intake...on deceleration and intentionally if the combustion temperatures are too hot~ when malfunctioning can really play hell on performance as well~...of course your OBD-II diagnostics would tell us should we fix it or leave it alone~

okay. thanks

the MAF is partially responsible for telling what to do with the EGR

I have the same problem with my 1991 toyota camry 4 cyl. please if you find the problem please share it thank you.

Hi my 94 200 si Camry is smoking black getting to much fuel but don't know where to look for problem don't want to idle as well theres to plugs on the throttelboddy I can take out both an there no response whatso ever it also has a miss can you help pleas

Check all vacuum lines.

Try smoke test. Build your own using glowing charcoal and cardboard in a sealed can [old pressure cooker] with input hose air from tire pressure pump, and smoke output hose at top of can. Pull off vacuum hose and insert smoke hose and watch for smoke leaks.

i have 1997 toyota tacoma 2.4 same problem o2 sensor maf spark plug nothing fixes any coments