Same exact problem
I have a very similer problem going on with my 87 supra turbo, i found out after replacing spark plugs fuel regulator .... that i had a plugged strainer on the fuel pump in the fuel tank and plugged fuel filter which restrict fuel pressure due to the rust in the fuel tank. The fuel pump was working extra hard to pump through the rusty strainer. There is a drain plug in the center of your fuel tank try to empty some of the gas in your tank and see if it comes out clean or not.
Iam curious to know if your car has the same problem as my car did. Good luck.
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Andy
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