1991 Ford Thunderbird Making Noise - Engine

Question: 1991 tbird lx when warm and sometimes when cold hesitates and backfires when acceleration over about 1800 rpm. also ide1s at about 1200 rpm and when driving with foot off gas keeps a steady 40 mph or slows just a little. It also backfires when acceration. It is the 5.0 v8.... I have repalce rotor, cap, plugs, plug wires, erg valve. cant find the damn pvc valve or would replace that . any ideas? The car has been sitting for about a year before i bought it . help please

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Technican: Was the car doing this before it was parked? Does the check engine light come on at any time the engine is running?

Owner: there are no engine lights on and it is not know if it did it before, but it is thought that it did not when asked of previous owner he did nto remember

Technican: Do you have a service manual for your car? There is a free online manual available that is the equivalent of a Haynes or Chiltons manual. The first thing you need to do is get the idling down. The most likely causes are a vacuum leak or idle speed motor problem. The idle speed motor could very well be sticking at this point. The online repair manual is available at autozone.com (once there click Vehicle Repair Guides). If you have any trouble accessing the site I will send you a direct link to the repair manual if you give me your email address. Note- Restoring proper idle is the starting point in repair. Once idle is better we will move on to any remaining problems.

Owner: how do you find a vaccum leak?

Technican: There are several methods. Please use extreme caution around moving engine parts and with flammables. The safest way is using a hose. Place one end of hose at your ear and place the other end at potential leaks (IE- the intake gasket, throttle body gasket). You will hear a distinct hissing sound if you find a leak. Other methods involve using carb cleaner or propane to distribute along suspect areas. A change in idle indicates a leak. I recommend against these methods because of the risk of fire/explosion. To properly test the idle speed motor/valve remove it and temporarily plug it's passageway. Is there a change?

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