Question about 2000 Harley Davidson FXST Softail Standard

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Rough idle Spits and sputters misfires fouled plugs

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Russell K. Campbell

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Are you using correct plugs & gap, is the air filter clogged, are plug wires bad & leaking current to plugs, is coil bad?

Posted on Feb 10, 2015

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Rough idle on 99 chevy metro 1.3l engine. changed plugs good pickup but intermittent misfires. even when idling. also leak in exhaust system.


First thing, fix leaking exhaust, this can cause erratic idling...second thing, remove and clean IAC valve and MAF sensor..dry and replace, also try putting some SeaFoam in the petrol, engine oil and air intake, let sit for 10 minutes then go for 10-15 min drive...suggest you change engine oil shortly after driving about 5000kms, if the oil is old..

Did you get any codes on the misfire? If you did not, test ignition coils, test vacuum, test fuel injectors, verify correct plugs..That's right, anything from a fouled spark-plugs to burned cylinder head valves can cause a misfire. Whatever the root cause of the misfire, the bottom line is that one or more cylinders are not contributing to total engine power output. This leads to power loss, rough idle, unstable RPM and bad gas mileage...cheers

Jan 31, 2018 | Cars & Trucks

1 Answer

My 2003 tbird has begun to sputter badly


Explain sputter - misfire ? When ? ,idle ,all the time ? The check engine light on ? You should have it checked out , have a shop hook up professional grade scan tool , check engine data for the sensors . Could be mass air flow sensor dirty or bad ! could be a fuel problem . Plugs fouled from running rich !

Sep 03, 2015 | Cars & Trucks

1 Answer

Can too much oil cause rough idle , sputtering and shaking in vehicle ?


I most case No but if the motor is a high mileage motor it could oil foul the plug once that happen it would continue to run poor tell the plug or plugs were cleaned or replace.

Jun 04, 2014 | 1996 Subaru Legacy

1 Answer

02 v rod idles rough and sputters


Hi Jubal, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Codes 1130cc com The 1 Harley Davidson Rod Forum

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Jan 19, 2013 | 2002 Harley Davidson VRSCA V-Rod

2 Answers

2004 grand cherokee 4.0l one day it will run fine the next day it runs rough rich and when i step on the gas the engine cuts out and spits and sputters


When the "spits and sputters" happen are you in low rpm? Can you "by-pass" the sputtering by accelerating? Has your gas mileage suffered?

Nov 27, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

I have an 89 s10 blazer 4.3 TBI that spits, sputters and dies at an idle and seems like it misfires as driving, no check engine lite came on. gave it a tune up. replaced the EGR valve , Ran perfect for a...


ing. mod. and coil pack may be starting to go bad had same trouble with mine only a tune-up problem solved then came back be fore i put car on di machine found that coil pack was bad! when if you scange coil pack or ing. mod. replace all, if not will have problems again.

Jun 12, 2011 | Chevrolet Blazer Cars & Trucks

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