Did you pull codes yet? You are looking for 12 or 14. 14 is specifically igntion failure. That doesn't mean component failure, just that you didn't get IGf to the ECU.
You likely have a connection problem, since you have both airflow meter codes. They have a common supply voltage, so that could be it also, but a connection fits the puzzle quite well.
You can pull codes for it.
In order to have a dramatic reduction in milage, you need to have a major malfunction that you would notice. Such as no overdrive. You might not notice converter lock up. The tach will drop like 200 rpm after you steady the throttle. If it does that, it is locking...
How many BTU's does a trans cooler need to expel at different HP levels? Some are rated at vehicle weight, which also makes sense.
Say 300 hp, 400 hp or 500 hp?
I don't have an 86.5 diagram, but will use the online 89 version.
Since your 86.5 can't be that different from the later, you don't have power to the distributor. It generates a signal on its own. Uless you are talking about spark from the coil...
In reality and not hypothetically, you don't have a MAP sensor, unless you are VPC or MAFT-Pro.
The short answer is the ECU will substitute a known good value. If JJ gives you a long answer, then you will know more.
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