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Discussion Starter · #1 ·
I'm really at a loss here....it revs up and down when i start her up after the engine cools down but once its warm it runs no problem and runs smooth as can be. seems to rev up no problem warm or cold.

2 weeks ago I blew a heater hose and it sprayed pretty much everything on the back side of both sides of the engine.

I changed the IAC, checked for water leaks, changed plugs/wires, and I saw inside all 8 of my cylinders and they still have the cross hatch on them and some slight carbon build up.

video here:

YouTube - 98 mustang unknown problem

my guess is egr sensor or maybe a dirtry maf
 
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