94 Gs300 no throtle responce and back fires threw intake

Gas in the oil can only get there threw the injector/s. One is stuck open. replace them all if it is worth the car. Back firing, I would check compression on the cylinders first, add a little oil first to all cylinders first, one or more cylinders are dry from the fuel, before putting any more money into it. Back firing threw the throttle body, could be timing or burnt valves.

Sounds like timing belt

sounds like either ur iac /or ur tps more then likly ur tps, throtle positioning sensor it controls ur feul intake more feul harder the engine runns, but iac idle air control it tells car more air higher idle less air tells tps less gas lower idle there all linked together have it put on a scanner that will narrow ur possiblities right down to the problem

timing chain can cause this back fire thru intake.

Time to see a dealer on this.

I would check the computer for codes first.

Just keep going its probably got a load of muck in it from the bottom of the tank put some injector cleaner in fuel tank and it shouk put its self right

sounds more like a vacume problem than a sensor, but the way I would start is go threw all the vacume lines you can. they are easy and very cheap to replace. check for any insignificant defect cracks warps distortions in the line. Anything. Then remove your air filter intake line to the throtle body. remove the throtlebody its only 4 bolts and usualy to sensors. The throtle body may just be dirty, clean it out inside and out. Then chek you aire intake sensor, sometimes its called an idle sensor, last check the throtle body sensor. Also if you still have your old mass airflow sensor clean it up with the proper mass air flow cleaner and return the new one. Because obviously it wasn't the problem.

Now is the time I tell you all about proper maintenace. Did you replace your air filter, when is the last time you changed your plugs and wires. I really like the bosch platinum 2 plugs. They burn a litle hot but not to hot, which means more burn and cleaner, less emissions. Hint hint to you that have to pass a emissions test every year.

You may want to go on utube and check out a product called Seafoam. I have had a lot of success with this product. It goes in your gass tank in your oil, and the third part goes in your vacume going into your injectors. It does clean a lot of **** out of your car. But I warn people that this is a at your own risk kind of thing. I know how to take my engine apart and fix it do you. Because I wont come to your house and rebuild your engine if you mess it up. Sorr for the rant but l have to give that litle disclaimer out.

After you have worked on all the things I have told you I believe you will have fixed your problem, if there are any problems or questions send me a message and let me know.

Tepfy

This is a bad throttle position sensor

Check your cap and rotor button on the distributor and check you plugs and wires also to make shure nothing is cracked or burnt out.