bad idling and gas mileage


Asked by Jul 16, 2013 at 12:26 PM about the 1998 Chevrolet S-10 2 Dr LS Extended Cab SB

Question type: Maintenance & Repair

I have a 98 chevy s10 and everytime im doin about 45mph or 50mph my truck will start to idle weird it feels like misfiring, my check engine light is not on but I have replace both spark plug and wires, throttle sensor, fuel filter and also did a diagnostic and it showed nothing guys sayed it could be camshaft sensor but my truck runs great only bad is between 45 and 60mph and 150 miles off a full tank of gas

9 Answers


Sounds like a major tuneup, too much air getting in when flooring the peddle! My opinion only a back alley mechanic would find it sometimes before a shop!!

okay...could be many things, but we will start with an idle air control...put one of these units in there and report~

4 of 4 people found this helpful.

The fuel pressure regulator if hose is cracked will not issue full fuel pressure and will be sucking air leading to high-idle/bad performance...this is a non OBD-II device which would not be picked up by the onboard diagnostics~ bad moojoo man-

5 of 5 people found this helpful.

back to basics...make sure the battery is newer than five years old as will start playin' hell with your alternator...the 1/0 cable off the battery as it attaches to the chassis should be wirebrushed clean...what you don't know is that it actually 'welds' this connection with every use and shared the same ground with the dainty electronics of the ECU....yes combine a 300 amp load with a 120mA

3 of 3 people found this helpful.

The EGR (exhaust gas recirculation) valve is supposed to engage when combustion temperatures get too hot, and upon decelleration...yours could be disassembled and cleaned with bra-kleen~

5 of 5 people found this helpful.

No "mark helpful"? all of these solutions could provide excellent performance~ what ya gonna do with a drunken sailor?

3 of 3 people found this helpful.

I'm sixty points away from making GURU #3're holdin' me up, man~ I give good answers and get not even a howdy do from you....shame and waste of effort...not to complain...could you give a guy a break....I'm here workin' it for you....I'm never coming to this restaurant again!

2 of 2 people found this helpful.


1 of 1 people found this helpful.

...a rabbit.~

2 of 2 people found this helpful.

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