Quick answer...yes/
make sure the timing is right, no vacuum leaks, or the carb could have a bad accelerator pump in it.
check for vaccum leaks.
That engine is computer controlled therefore the idle was preset / calibrated from the factory and there is NO adjustment. You need to have the engine scaned with an engine scanner to see what is making it Idle to fast. Check for vacuum leaks first.
Yes it could....but I'd start with checking the idle air control valve, check for vacuum leaks and check the fuel pressure.
It depends on the year. If you can't get the idle down, check for vacuum leaks. That seems to be a primary cause of high idle, especially for the TBI engines.
Go down to an auto part store and buy a cheap vacuum guage. Hook it up as directed and read the results. There are instructions that come with the guage that tell you how to interpret the results.
The idle speed is computer controlled on a LT1 engine. If it is a little high, try checking for vacuum leaks.
Yes, it could. What could happen is it leaks as you are going down the road and leaks onto the exhaust manifold and creates the smoke.
I have a 1998 also and the same thing happened to me. What I found on mine to fix the issue was that the vacuum line from the control valve that is located next to the battery on the firewall has a plastic tube connected from the valve that goes down to the actuator on the front axel. The plastic vacuum tube rubs up against the battery box. The residue acid from the batery terminal leaks down the side of the box and rots the vacuum line (for me it rotted three lines there). I just cut back the lines and used a good quality rubber vacuum hose to reconnect the two plastic vacuum lines and that fixed it. No matter how well kept your battery is you will always get a little seapage from the terminal so clean the battery and box every time you wash your truck and you should'nt have the issue again.
When the RPM of a car drops down and stall there is an issues with the air fuel ratio. The engine should be checked for vacuum leaks,
My grandson says, "because it broke down". But to be more specific, check the shift-down linkage and/or the vacuum modulator (if your transmission has one).
Look for a vacuum leak. Could be anywhere.