: Rough start

05-15-12, 03:44 PM
07 STS 4.6, At first start of the day the caddy is really rough idle for about 20 seconds takes a few engines cranks to start. No Check Engine Light, rest of the day starting is fine. Have tried injector cleaner, cleaned MAF sensor. Anyone got any experience in this matter or suggestions?

05-15-12, 05:20 PM
Tighten the intake manifold bolts.

05-15-12, 06:51 PM
bolts are tightened, i do check those regularly and i just double checked.