Question about 2001 Pontiac Grand Prix

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Not picking up gas when engine is cold, sputtering, bogging out especially when travelling uphill, Is this some sort of a sensor maybe??,the spark plugs are new. thanks

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  • Pontiac Master
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Check fuel filter. it is starving for fuel. unless the fuel pump is bad. check filter first, then go from there. symtoms of a bad coolant sensor--poor cold idle, stalling, rich mixture retarded timing, slow idle speed, cold hesitation or stumble, poor fuel milage.

Posted on Aug 20, 2010

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Your excellent description provides a very short list of possible culprits, since your vehicle's symptoms all appear during periods of higher fuel demand.

(1) fuel filter - clogged - your description is absolutely classic (especially stumbling upon uphill acceleration) for a fuel filter in need of replacement.
(2) spark plug wire - one or more bad - an engine can muddle along while traveling over level terrain with one cylinder intermittently failing to fire, but try to go uphill (even the slightest grade), and the engine will skip badly and can even stall if asked to accelerate.
(3) in-tank fuel strainer - clogged - same symptoms as clogged fuel filter.

The fuel strainer is a sock-like pre-filter attached to the input side of the in-tank fuel pump.

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Here's a YouTube video describing hoe to replace a fuel filter on a 2000 Honda Civic (the closest I could find for your 1998).

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