Thanks all,
I agree with the MAP or MAF sensor issue, so if i do deactivate a cylinder i will leave just the exhaust port open and close up the inlet port which should stop any issues with the ECU.
As Edkiefer suggests the 626 91 year may not have crank movement measurement, it is relatively old and it has had some problems in the past and no codes have come up so im not too worried about this one.
my car currently gets about 28 mpg or something close to that, i do not have an MPG goal i more take the approach that i will do anything i am physically able to do to help the MPG of the car and when i have nothing else i can change ill stop.
Looks like ill just have to test out a few things and see what happens, ill try to run the tests tomorrow and post the results.
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