1984 corvette ,bad idle, will not sustain rpms

Ok heres the question of the day. I have a 1984 corvette and I finally put it back on the road and it drove great. I was on the highway and out of the blue it seemed as I was runnig out of gas and lost all my power. I managed to drive it home and figured how to pull the codes. I was getting a 33 and 44. the 33 is the map sensor so I changed that. I still have the same problem. I reset the computer and checked it again and now only getting a 44. I looked up and down for a bad vachume I even changed one of the fuel injectors and still nothing. I was guessing it might be the ERG valve or the EGR sensor but the codes showed no indication that might the problem.
Thanks Tony  

You have one of those notoriously problematic crossfire injection systems. Do a google search for CORVETTE CROSSFIRE and you will find a TON of info on these in vette forums. A friend sitting here says to clean and tighten all grounds and check the manifold gasket for leaks. The common fix seems to be to remove it alltogether and replace with a different f.i. system or a carb. If you do that save it, someday those 84's are going to be more collectable and the origional induction might be a nice thing to have. Good luck.  

thanks xxxix
I will give that a good look and let you know how I make out. As far a the cross fire unit, I was talking to the owner of a corvette shop recently and he said I would be crazy to do that. I did have thought of doing that but he said my best results would be with the crossfire. Thanks for the info and I hope I can figure it out.  

hey xxxix ,what grounds should I start with and do you think it might be a vachume too.  

The ground issue reminded me of one of Kevin's Q&A answers in the current (May) issue. The vehicle is a 99 truck but the principal still holds true. The sensors for the fuel injection all work off of resistance so a poor ground will result in bad info to the ECM. A vacuum leak was also mentioned by xxxis, this too will create bad readings, the MAP sensor in particular. Good luck with it.  
Jim
70 El Camino
461 solid, m20,
pics in readers rides

I suggest going to a Corvette forum or CamaroZ28.com.
The main issue is that they tend to warp in the back of the engine because of insufficient cooling. These areas cause vacuum leaks that are not repairable. Thats why GM scrapped them for the tuned port system. Do what you want, its your engine. Those induction systems can be made to be efficent, but it all depends on what you want to spend.  

I know just the raw basics about f.i. The advice I gave was from a friend who happened to be here while I was online. But as far as grounds go, I would check any engine to frame straps/cables first. Then any grounds that come off the battery(big ones and little ones). Then anything that might be grounded to the engine or firewall. Like I said I don't know much about f.i., but thats where I'd start. And yes, a leaking manifold gasket whould cause a significant vac. leak. Sorry I can't help more. Check out those vette forums. Good luck...Chris  

Thanks Chris I will keep looking.  

Hey Chris
Does this sound like a bad cat? My Dodge truck just had the same problem and it ended up being the cats as well. Thanks Tony  

Generally when a cat is clogged your engine runs hotter. Your exhaust manifolds can glow red after a brief high idle(2000rpm). Hopefully someone more knowledgable than I will reply. I once thought I had a clogged cat on an older camaro, so I hollowed it out with a broom handle. Didn't help. Turned out to be a clogged jet on the carb causing the engine to run like crap and hot(because it was running lean). Probobly doesn't help you much.