my 97 f150 all of a sudden started idling rough when I started it today. It is doing a continuous rev up and down while it is idling. Also noticed the smell of gasoline after running the engine
for a little bit
JA: Is the rough idle intermittent or consistent?
Customer: its consistant rough idle. Like it is trying to stay at correct RPMs but not able to hold correct idle speeds
JA: What is the model of your '97 Ford?
Customer: 5.4 litre v8 ford F-150
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes I plan to. I checked fuses and searched for vacuum leaks and thinking of possible IAC or TPS sensor fail
JA: Anything else you think the mechanic should know?
Customer: when I give it gas, it will rev up and run okay but I do get the smell of gasoline while it is idling rough so I am also thinking it may be something to do with spark plug
failure causing misfires or possibly a fuel filter or fuel pump going out?