98 grand marquis Ls will not start
The 98 Grand marquis Ls 4.6 in question was running without a problem on the 30 minute drive home last night. And has been running without a problem for the last year I’ve been driving it other than a battery light that would turn on occasionally….
I went to start it back up about 30 minutes after parking and it started but was bogging down a bit at idle. Tried to pull off and it could hardly get up the driveway. Turned off the engine and tried to restart and ran for a minute or so but was really weak, bogging down worse. It died after a minute or two of idling and currently refuses to start. I thought it might be a battery issue as the battery light had been on and off (despite checking the battery multiple times at advance) so I changed the battery to a fresh one I store for another car, no good. The car cranks hard but won’t start. I dont know if this matters as I'm pretty sure the car has coil packs but it's really snowy here, I dunno if that could affect anything or not.
Any suggestions as to what I should look for? Where I should start? Was the battery light trying to tell me something?
I dont think the plugs have been changed in at least 3 years, could this just be a plug issue?
Thanks in advance