More information might be helpful. First thing, how many miles on it? Next, when was the last maintenance done? Spark Plugs replaced?
Some things to be warned about. Plugs in the 3-valve heads are a special plug that break about half the time when you go to take them out. They then need a set of special tools to extract the old plugs and install new.
Second thing is DO NOT clean the throttle body - unless you want to buy a new one to the tune of $300 to $400. Ford throttle bodies are designed to not require any maintenance. They also have stickers on them warning you that they are not to be cleaned.
Given your symptoms, my first guess would be spark plugs or ignition problem. Getting a sulfur smell from the exhaust would indicate excess fuel or fuel not being burned. That points to ignition problems. Injectors are delivering the fuel but the ignition is not burning it. Over all, I have found injectors to be VERY reliable.
A scan for trouble codes would be in order. That will at least tell you which cylinder or cylinders are causing the problem. Above all, do not just start throwing parts at it. Do some REAL diagnosis and act accordingly. You will save money in the long run.
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