i have a 1986 pontiac 6000 when u start it it’s fine ,while driving it sometimes want to bogg out when u try to accelerate,i’ve put fuel pump and filter,plugs,wires,ignition coil,rotor button,cap,cut the converter,traced down bad vaccum hoses,so far every shop has been guessing and i still have the same problem,now another shop is saying that the intake gasket is leaking allowing air would that cause the problem i’m having.
An air leak will cause a rough idle and it will occur all of the time.
These cars were available with TBI, FI, or carbureted. Which one do you have?
When it bogs, does the engine quit running instantly, does it sputter and cough, buck and jerk, etc.?
the pontiac is carb,when it boggs it don’t cut off it sputters like it is getting to much gas.
You might consider the possibility of a gas cap or canister problem that is causing the fuel tank to pull a vacuum. Try leaving the gas cap loose and see if the problem goes away.
Some more possibilities could be a carburetor float needle sticking, a choke flap not opening all of the way, a sticking EGR valve causing it to hang open, or possibly an electronic glitch causing the timing to retard. (I would not put a lot of faith into the last one).
Any Check Engine Light coming on? Have you tried pulling the codes?
A intake leak is one of the easiest things to confirm. Any competant shop should have a smoke machine, which pumps smoke into the engine, and you check to see where it comes out.
Also a 22 year old carb can definitely cause a bogging problem. carbs are common for bogging problems, but the only way to confirm its condition is to disassemble it. A torn diaphram for the accelerator pump or a leaking float commonly cause this. You are REALLY looking at spending some MONEY to finish this repair on a car not worth much. It’s never too late to cut your losses and let this car go.
You are driving a really old car. The repairs are worth a lot more than the car. A replacement car is the cheapest solution.
The problem is you’re driving a car built when Ronald Reagan was president with a Carb. Most young mechanics have never even see a carb these days unless it’s on an vintage musclecar they’re working on at home. Heck the last time I rebuilt a carb myself it was on a lawnmower. Find someone old who knows how to rebuild a carb properly if you feel like putting more money in the car. More than likely it’s a mess inside.
However, if possible I’d recommend upgrading to a newer car for a hundred different reasons that involve reliability, safety, efficiency, performance, comfort, etc etc. I mean even if money is tight a Honda or Toyota from the 1990’s is worlds better. Although something built in the 21st century would be ideal. Good luck.