[Hybrid1990crx]

Ok so my 90 si doesn't run as fast as my 89 si did. A friend of mine said I may be feelign this because my 89 had a bumped up compression a bit from the z6 headgasket and had a 421 header on it. I don't think its because of that.

I am throwing a code, but its a 17, speedo sensor. My 89 had this before too and didnt cause any problems.

The previous owner of the car replaced the map sensor and said this may be the problem still.

The car runs fine, idles great, revs all the way to redline, doesn't smoke or anything, seems to be a strong motor.

What would you guys sudjest for me to look at first? I have a whole nother car for parts so I can replace anything i need to. Thanks guys.