Timing belt, vvt drum worn out, thin oil in engine, burnt valve, bent valve if timing belt jumped, injectors cloged up, weak fuel pump, intake leak pcv valve worn out vac hose leakage , worn rings
possible vacume leak in the egr valve or bad valve itself.
rough idle smell gas
throttle body or idle air control value
It's usually next to the throttle body
The most common cause of a 1996 Ford Escort to idle rough is bad spark plugs or bad spark plug wires. A plugged air filter will also cause it to idle rough.
the radiotor or the cams
A bad IAC (Idle air control valve) or a vacuum leak or both.
I am having the same problem, and poor acceleration!!
jerking speed 40 50
P1000 on any ford means you have cleared the PCM codes and it hasn't run it's self-diagnostic tests yet. This will go away. It is not related to your rough idle.
injectors are a common problem
The choke mechanism on your 98 Explorer could be sticking. The EGR valve could also not be functioning right. Either of these issues could cause the rough idle problem.