Whenever I try to start my fiero after like 5 hours of sitting, the car rev's itself to around 2000 rpm...then quickly drops down to 500 rpm where it sounds like it's going to putter out, but then quickly shoots back up to 2000 rpm and then stabilizes. If I reverse during the upper 2000 part, it'll do the cycle again until it stabilizes. winALDL says I have error 33 and 35, also if it's of any help, my temp gauge doesn't work, it's all the way left (doubt it's related?). What's wrong?

Thanks

TTT
The car is running the stock 2.8l v6 too

Well..the only help I have is that code 33 is MAP sensor, and 35 is Idle speed error. You could start by checking your map sensor. Here is a list of all the trouble codes and what they mean : https://www.fiero.nl/cgi-bin/main.cgi?ECMCodes

Good luck!

My car does the SAME EXACT THING! Does your Oil Pressure gauge drop real low sometimes when you come to a stopsign or something? When mine does that, the temp gauge goes up a little bit at the same time, but once I take off again, my oil press. is the same and my temp goes back all the way left! Hmm...

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86 GT -- All Options except Performance Sound

Yes it does - a lot brad :/

Hmmm...now this topic is interesting to me, as well! I have a code 44, and I am going to diagnose the O2 sensor right now...Gotta love the factory service manual!

it could be a vac leak make sure the rubber end pulled a liitle off the hard plastic line

Sprayed around with throttle body cleaner, and no luck with vac lines being messed up.

Bump

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Check for a vacuum leak around the egr tube. I didn't find mine the first time, but it was the cause of my code 35, and those tubes are definately a problem on these cars. Low vacuum could cause the 33 as well.

Wow. Just like said, my EGR tube has a hole in it near where it connects to the plenum! What is the most cost-effective fix? Can I grab one off a Camaro at the J-yard? I can't afford a braided one right now.

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86 GT -- All Options except Performance Sound

from what i heard is you can but you have to do some bending to meet the egr valve and drill the mount hole bigger. I have to do the same thing to mine till i can aford a new one . this what other forum members told me i havn't had time to do it yet.

The EGR tube on my 85GT was just about completely severed where it connects to the flange at the intake manifold. It was hanging on by a thread.

I took it to a speed shop and had it welded back together for $15.00.