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Vn - Rough start & Rough Running Below 2k

ghog1726

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Hi, iv recently changed the motor in my vn now since iv put it in the engine light is on (which never bothered me coz it WAS runnin alright), however now when i start it it idles reallllly low. as in 500 maybe less for anywhere up to 5 seconds. then jumps up to about 1500 then slowly goes down to a more reasonable idle, the problem is when i come to a stop at a set of lights or something similiar it also does this and when i accelerate unless i boot it splutters and coughs till about 2grand, then runs perfectly fine, any ideas?
 

Not_An_Abba_Fan

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Do you have a vacuum leak?

Have you done an error code check?
 

ghog1726

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hey, all fixed, silly me didn't have the vacuum for the map sensor plugged on, fixed everything:), then i had a bloody coolant leak but its fine now too lol
 

HARVZ-6

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baha gona say exactly that..

my bro left it unplugged but vac line to motor blocked off..
 
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