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1994 3.1 lumina euro rev limiter . map sensor, miss


fastamp;furious

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Are rev limiters standaed on this car? If i open it up from idle in neautral it cuts out at 4000 rpm. also the rough idle and miss seem to be in the 750-1000 rpm range then it smooths out. in earlier post i described a clogged cat issue. could the map sensor be the cause of the miss and clogged cat????. when I tested the map, the voltage , key on , engine not running , it was 3.8 volts(within specs) but when i started it up it was suppose to increase by 1.5 volts .it didnt... and when i went wot it was suppose to increase to apox 4.5 volts , it actually dropped to about 1 volt. and if i have a bad o2 sensor or map or clogged cat shouldnt it be throwing codes?

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