could be injectors, temp sensors, vacuum leaks, spark plugs, wires, distributor cap and rotor, fuel distributor, etc etc etc. This problem could nickel and dime you to the poor house. Id do a search on it and see what other people have come up with...

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual