Question about 1988 Ford Crown Victoria

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1988 Ford Crown Vic Strange Idle (Getting Worse)

I have a 1988 Ford Crown Vic with the 5.0L EFI.

Upon start-up the engine has a alternating idle between high and low RPMs....Then if i put it into gear, the idle becomes EXTREMELY rough, and tries to shut the car down.

After i give it a little gas, and drive down the road, it stops, and run absolutely fine..

PLEASE help me, i just bought the car...

Ive ran injector, and fuel system cleaner through it, as well as changing the fuel filter.

HELP ME

UPDATE :


Well...

The Check Engine light is not burn out, or lit up...

i took it to Autozone anyway.

got nothing.

Its getting worse, and is not starting to stall under light acceleration. When sitting at a red light, it idles so rough it rattles the entire car.

Now i am starting to hear a rattling coming from the bottom end.

I have replaced the plugs, wires, fuel filter, changed the oil......i have NO idea what's going on...

any ideas?

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