few problems

[PUGBOY86]

hi all im new to the petrol peugeot
im having a few problems my s reg 406 has a 1.8 16v im hoping you guys might be able to help me with a few problems
problem one:
i have a miss fire when idleing and when you rev it its still present
problem two:
the top cover that covers the spark plugs one of the alun bolts are rounded is there a way i can get it off without damaging it?
problem three:
i have a vibrate when i go down the revs just above tick over

if anyone can help it will be greatly appreciated
thanks guys

[modified406]

problem 1
check spark plugs
or idle control valve

problem 2
can u get me grips into it if u can try n get a good grip of it

problem 3
could be exhaust vibrating
check heatshield and check exhaust mounts

[steve_earwig]

Wouldn't be the idle control if it's the same when revved. Check plugs but could be coil pack.

Allen screw is damaged already, if you can't get pliers to it try tapping it round with a punch or cutting a slot in it. Failing that it's out with the drill.

Probably heat shield but it could be a disintegrating silencer.

Btw welcome aboard

[mjb]

I'd suggest fitting a new coolant temperature sensor, as it can be the cause of misfiring...