SOURCE: Running rough
Could be a bad catalytic converter, check under the car and see if they turn a hot red color.
SOURCE: hi i have a 1988 ford f150 it idles up and down
Check fuel pressure regulator by removing the vacuum hose. If idle does not change or fuel comes out of regulator replace it. Otherwise check your injectors one at a time while car is running. If idle does not change replace it.
SOURCE: truck idling smooth suddenly rough
Please post other info. model, mileage, engine size, year, any work done to it recently?
SOURCE: engine Smoke from exhaust with foul smell
four cylinder?
It is not uncommon for these engines to start to "burn" oil. Check the oil level and confirm that it is low. If it is make sure to top it off and monitor the level.
Next time you change oil try using a oil designed for high mileage vehicles. We have been using Mobil High Mileage at the shop with pretty good results on higher mileage engines with oil consumption issues. We have have several of the same vehicles as your use the product and it has helped them as well. It can't hurt to give it a shot.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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