When I'm accelerating the car acts as if it was missing sparks or as if I had a vacuum leak. It only happens when I'm starting to accelerate. Once I push on the gas all the way it gains power again and it drives great. Or if I step on the gas to fast or better said if I push all the way to the bottom fast it will loose power. If I step on the gas little by little it will work just fine. Any ideas? I changed the carburetor mounting gaskets and checked the vacuum hoses and all look good. I replaced the oxygen sensor not too long ago. The distributor has been replaced and the cap and wires too. Thanks for the help.
That helped, thanks a lot. I don't know if that was the real problem, but I also flushed the mechanical fuel pump and changed the PCV valve and now the car runs pretty good. Thanks again for taking the time to help me.
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Hi, try reving the engine in nutural, do this in dark garage, you might see a spark leaking from HT leads or distributor cap, Check each lead with a ohm meter, resistance should not exceed more than 8000ohm per foot of lead. If in dought replace as a set.
To check for a vacuum leak, Allow engine to idle, spray a small amount of engine start from a can, around inlet manifold, and any vacuum pipes etc. Any increase in revs would indercate a vacuum leak.
Check for a malfunctioning EGR valve. This valve is only selected to perform when the engine is warm. It has a vacuum diaphragm which can crack and lead to vacuum leaks. This will cause rough running. The EGR valve should be vacuum checked to see if this diaphragm is leaking. This valve can also stick open due to carbon deposits. When the valve sticks open, the fuel/air mixture is leaned out and rough running ensues. This problem is practically expected on a vehicle of that age.
check for a small vacuum leak speciallythe lines going to the throtle have someone look at it while you seat onthe car , idle ,FOOT ON THE BRAKE ! a way to test for leaks if to spray a lil wd40 around the lines an listen if the idle gets better or worst, sometimes the reason the engine runs to rough or lean are vacumm lines that are slightly broken.
I have a similar problem with one of my Toyota Corollas. It's a 95 model with the 1.8L engine (7A-FE, automatic). But unlike yours, it has plenty of power while running. Here's what it does. Occasionally the engine misses. Sometimes it will die. This is most likely to happen when you start the car and put it in reverse and start rolling without giving the engine time to adjust. I've been told by some customers that it will die sometimes when coming to a stop. But this has never happened when I drive it. I don't think it's a fuel issue because the car runs just fine when it's running.
Here's what I've tried so far:
Replaced spark plugs and wires.
Used gasoline additive fuel injector cleaner.
Checked air filter.
Checked vacuum hoses for leaks.
Replaced PCV valve and hoses.
Cleaned the air intake and throttle body with carburetor cleaner.
So far there is no change in the problem.
What I plan to do next:
Check the throttle position sensor.
Check the MAF sensor.
Adjust the idle via the set screw.
After that I have no idea what to do next if the problem persists. The check engine light is not on so I don't think there are any error codes. Will let you know.
Try this: Remove the two (primary & secondary) vacuum diaphram covers & inspect the vacuum diaphrams. If there is any evidence of distortion at the diaphrams, expect to get the condition that you are describing.