"cough"

5

Asked by Feb 05, 2011 at 10:26 PM about the 2002 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

A new MGM owner and loving it! I notice at 50 - 60 mph and "lugging" a little going up a slight grade the motor will "cough". New fuel filter, new plugs, coil packs "look" ok.  any ideas?

2 Answers

3,935

You could be using gasoline that doesn't have a high enough octane rating. High-compression engines need higher-octane fuel to avoid detonation and pre-ignition problems.

1 of 1 people found this helpful.

run a can of sea fome fuel injector cleaner in a full tank of gas,is the best stuff on the market,it could be a cloged injector from this crappy stuff they call gas today.if you can afford it put in 93 oct with the cleaner.

1 of 1 people found this helpful.

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