Weird issue need help please!!

[ADB98]

I really need some help and am pulling my hair out for a fix. I have a stock 93 K8 limited edition MX-3. I recently starting noticing that she would not get passed 75mph. Now its to the point of 60mph. I can throw it in any gear and she will not budge. Just stay at 60mph. From 45MPH to 60mph a mac truck can beat me. Here is what I have done. I recently (6 months ago) changed the distributor. Our cars don't like the manufactures. I changed my air filter recently. No go. I changed my fuel filter. No go. My VRIS pumps seem to work but only under great RPMS and only breifly. Is that normal. Great suction going to into the two siliniods. I checked all the vacuem hoses and they seem ok. Any suggestions???

[MazdaManiacMx3]

Are you getting a light ?

[ADB98]

I have no lights but I think my O2 sensor may be stopped up. Could this be a cause??

[andy]

its possible the catylitic converter is clogged and getting worse. one simple check for a clogged cat, it will glow red hot if the clog is sever.
You could also take it off and shine light through it. It can be a pain taking it off if you snap any of the bolts. but this is a more accurate way of making a decision.
Andy P. 93 GS

[ADB98]

Andy you are the man!! That was totally it! I might sound stupid but I think it was clogged since I got the car. It halls all kind of *** since I cleaned it out. Thanks!!!!

[TheFkdCanuck]

Cleaned it out? How'd you do that?<p>I just pulled mine off, and replaced it with a straight pipe. I don't need to e-check, but I'd like to get it back on there for the backpressure.