I don't know the answer to that. I don't have anything with electronic throttle so I haven't had to deal with it. You could use pressure testing, but I don't think it is a straight forward answer since you will have to consider more factors.
You could just try the window up/down coast test at high speeds to see if the difference is more pronounced.
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1973 Fiat 124 Special
1975 Honda Civic CVCC 4spd
1981 Kawasaki KZ750E
1981 Kawasaki KZ650 CSR
1983 Kawasaki KZ1100-A3
1986 Nissan 300zx Turbo 5 spd
1995 Chevy Astro RWD (current project)
1995 Mercury Tracer
2017 Kawasaki VersysX 300
2022 Corolla Hatchback 6MT
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