I have a mechanic buddy who is good at finding vacuum leaks. He takes a high flash point solvent and spray it around on the intake. Near vacuum lines and around the intake mating area. Use the little red tube for accuracy in spraying. Spray a little at a time, with the engine running. You will notice the engine RPM's will come up when it sucks the solvent in the motor. Feeding the motor more fuel that is from the spray can. I'm sure he uses carburetor and/or injector cleaner in the spray can. Brand doesn't matter. Avoid the hot exhaust manifold at all costs. A sucking/hissing noise will be heard on bad vacuum leaks. Wiggling vacuum lines and gently pulling on them will make leaks surface too. If you see cracks, breaks, or severe dryness....Replace these line for best results.
tercel
Check the 96 Blazer for any vacuum leaks in the system. A vacuum leak can cause the air flow to only come out of the heat vent.
Severe Vacuum leak.
Take it apart to determine the cause. Only then you will be able to fix it.
vacuum leak or 02 sensor
No
replace the hose or gasket the is leaking, you can spray carb cleaner around the eng whil runnig to locate the leak the eng will try to stall
Perhaps throttle plate is stuck open. try to "free " with a screwdriver or perhaps a vacuum leak
To fix an oil leak in a 96 astro, first you need to find the leak. Clean the engine thoroughly at a car wash. Watch the engine daily for signs of the oil leak. Once the basic area is found then the process of fixing the leak can begin.
I recommend Alldata or Mitchell1 Ondemand.
Usually just needs a tune-up... plugs, wires, etc. Could be dirty/failed injectors or a vacuum leak.
There are seven spark plugs on a '96 Tercel. This model has them mounted under the rear passenger seat next to the distributor.