a bad fuel ralay, or just a bad fuel pump.

 

i fix the idle by adjusting the screw located on the throttle body now it idles perfect and when i start my car first thing in the morning it seems to be fine now but the car still jerks like it's not getting enough gas or spark while decelerating randomly, and it's not getting any better and it's not getting worst,today i cleaned the throttle body with some cleaner and greased up the throttle cable, i noticed that it idled a bit higher than normal but car still jerks randomly while decelerating. i don't know what's wrong but i need your suggestions if i'm gonna change some parts what would you guys think will be good to do first,change the distributor? or fuel pump and main relay? for all the symptoms i posted here which parts(s) will be the best solution for this problem thanks.

 

if it does that on decell its most likely the air idle control. that controlls the air into the engine while the throtle plate is closed.

 

but i thought that the IACV is only for idle and my car idles fine now it's just that the car jerks randomly while decelerating and just stepping on the gas steady around 2500 rpm it kinda bogs,could the IACV has something to do with it while driving?
like i said it feels like it's not getting enough spark or gas in some point.

 

i was doing a search on this forum and i found that you had a similar problem like mine right now, how did you fix yours? thanks.

 

its my map sensor, the harness was broken

 

iac gives the engine the right ammount of air for when the throtle is closed and the car is still in gear coasting, so it doesnt choke out, or sputter.

 

update.i changed my spark plugs last sunday and i noticed that one of the spark plugs ring (i hope you understand what i mean) is black while the other three were brown,so took it to the guy that did the swap for me and i showed him the plug,and he said that i'm running rich in one cylinder he says that i have a bad injector in one of them but don't know which one coz i forgot to mark them when i pulled it out, is there anymore possibilities other than injector to make one cylinder run rich? or it's only the injector responsible for that? please reply thanks.

 

if it stays open to long yes