Problems - R129 500SL - HELP!!!

[500SL]

i have a 1990 R129 500SL, its been fine in all the time ive had it, only around 2-3 weeks now, driven it on the odd occasion, then parked back up (sometimes parked on a steep forward/down facing hill)

after driving the car today, about less than 1 mile down the road, the car started to kangaroo, and then run like a bag of crap.

now when started, it misfires badly and there is a heavy petrol smell.
also the battery light is now on.

any ideas what it could be?

could different fuel have caused some sort of malfunction? i ask this because it was only yesterday i put some petrol in.
i definitely put in petrol! (NOT diesel!!!) but not sure if it was regular unleaded, super unleaded, or optimax. i will find out for sure tonight as i have the receipt somewhere, i cant think of anything else that could have caused it, unless it was just bad timing and something to do with regular wear and tear has let go

any help would be much appreciated

 

[Howard]

Are you 100% you put petrol in it ?

Check the reciept ...

 

[grober]

Water in petrol, problem with alternator/poly V belt, loose battery terminal??

 

[500SL]

Are you 100% you put petrol in it ?

Check the reciept ...

im pretty sure it was petrol, it definitely wasnt diesel.

Water in petrol, problem with alternator/poly V belt, loose battery terminal??

i hope its a simple fix, called out the AA who are on route at the mo, lucky it went wrong close to home. should be here in a bit, will see what they say. i hope its someone who knows about mercs

 

[500SL]

turned out to be one of the leads rubbing against a pulley or something!
it had cut through the plastic coating on the lead, the guy done a temporary bodge to get me home. need a new lead now! glad it was a simple fix. THANKS TO THE AA

 

[grober]

Result!

 

[500SL]

p.s. i checked the receipt, and it was definitely normal unleaded that i put in LOL!

never made the mistake of putting in the wrong fuel before, glad i havent started doing it now