gotta rebuilt carb, cause old one was shot( cracked body)anyway, car surges all the time.tuned carb, got a little better.new plugs, wires,ign. module, cap,all new vac. hoses,even new int. manifold gaskets.o2 sensor only has about 2000 miles.at idle, it jumps between 600 to 760 rpm.goin down the road, it feels like its got a fouled plug......cylinders all check out fine...no vac. leaks..........any ideas what to check??its either i find out what it isor im gonna have to bypass the frikkin computer, which i wanted to do later, when mileage got higher and i retire it from DD duty and sick it up a little.thanks in advance guys..........oh, pretty much stock 85 berlinetta, lg4, 102,000 miles

 

I saw something similar a while back. A shop replaced a carb, and also replaced the steel fuel lines with rubber lines. But of course rubber lines don't 'corner' like steel. It had a very, very slight kink which was disrupting fuel delivery.

Maybe fuel delivery?

 

thanks for the reply. but dont think thats it, got steel line, put a new fuel pump in a month or 2 after i got the car, along with the tune up stuff.gettin plenty of fuel.man, now i remember why ive never had a 3rd gen before

 

has nothing to do with it being a 3rd gen, my car doesnt surge it's modified and i'm using the computer, and a rebuilt ccc carb from autozone and it's fine, no bogs or anything, how do you know the surge is from the carb? check your timing.

 

didnt say it was the carb.timings fine.im assuming its something electronic. thats why i posted, ive had my share of built up cars, but dont the first thing about 3rd gen electronic emmisions controls. figured somebody might have an idea.everybody ive ever known whose had a third gen, never kept it for long, at least in stock form. dont get me wrong , i loved this car, up till now and never had a prob., but its seriously gettin on my nerves. im thinkin the old carb masked the problem an with the new one tuned right its showing up.

 

If the engine didn't surge prior to the rebuilt Carb, then it has to be the Carb (they don't always come the right way when rebuilt).

Although you have good vacuum, it sounds like it's in you're fuel delivery (inside the Carb).... with the ECM fighting for control (causing a surge).

By-passing the computer would be the best move you made, IMHO..... :lala:

 

yup, called advance auto where i got it last nite.told em after arguin with champions tech support it was the carb.they ordered me a new one and got it today.when the guy , who has a twin of my car,looked at the carb he saw how sh
*tty it was.so he figured it had to be sloppy inside.anyway, runs fine now, just gettin a code 34, not leaking vacc......book says it a differential pressure sensor.now i just have to figure out what the frick that it. thanks guys