why does my 4.0 shake and idle high on cold starts?

[holeshot]

In the last few days when i start my 2000 ranger after its been sitting awhile, the motor seems to be shaking/vibrating pretty bad. it feels like im going down the highway and a tire is out balance....but obviously the thing is sitting still.

prior to this, i noticed it would idle really high on cold starts, then go away once it warmed up. now it just shakes.

anyone have an idea?

 

[creepinjeepster]

IAC?
TPS?
How's your fuel pressure on the rail at turn key, engine off and after start?

 

[holeshot]

IAC?
TPS?
How's your fuel pressure on the rail at turn key, engine off and after start?

Sounds like i need to take it to the shop to check the fuel pressure. If it were bad sensors, would it throw a code?

 

[creepinjeepster]

Sounds like i need to take it to the shop to check the fuel pressure. If it were bad sensors, would it throw a code?

No, it won't always throw a code for a bad sensor. My 92 had a bad IAC on it and I never even got a CEL.