[armadillon]

Keep in mind:

*This problem did not start until AFTER the Rockers were installed
*Cleaned Idle Air Valve about 15,000 miles ago
*Cleaned MAF about 15,000 miles ago

So I have 1.7 Roller Rockers on my stock 5.0 (Present from bro, why not install them?)

When I start the car up in the mornings (it's like 78 degrees outside) the car idles really low (500rpm) and dies unless I give it gas.

Then once I get to the stop sign 50 yards down the road, the idle surges. It'll go from 600rpm to 1500rpm and back every 2-3 seconds.

THEN, after I get on the highway and have driven for about 5 minutes going like 70mph, I come to my exit and stop at the stoplight. NOW I have a nice smooth idle.

OCCASIONALLY, I'll be driving down a road and come to a stop and my idle will stick at like 2000rpm or even 1600 or somewhere around there.



I probably need to reclean the IAV, but since the problems didn't start until after I installed the rockers, I figured they were the source.


****My question is: Is the computer just freaking out because of the new rockers,or is it another problem? How do I solve the problem?


My setup is:

1989 Ford Mustang LX w/ 5.0HO
U/D Pullies
Longtube Headers
3.73's
Short-throw Shifter
Flex Fan

So Basically Stock

[Drick]

That is deffinitly unusaual bad TPS sensor mabey

[Tony_90fox]

put the stockers back on and see if it still does it

[Racinjason81]

def sounds like a bad tps,especially with a high idle coming to a stop

[Casper98GT]

Well im sure you removed the intake to put on rockers. Check for possible vaccum leak, or gasket problems. Also check all connections for the sensors. Could have a air leak too. Never know. good luck

[95opal]

+1 on the possible vacum leak.