p38 4.6 running rough

hi recently taken a1994 p38 v8 4.6 in p/ex( i supply wheelchair accessible vehicles) i have decided to use it myself. when i got it it was blowing from right manifold so was not running smooth as it should on tickover. i bought a used manifolld of ebay £30 and fitted it also new ngk bpr6e plugs. although manifold not blowing now, car still feels like it is not running on all cylinders i have used a tank of petrol with red x injector cleaner, still no better. can anyone advise
thanks burnsy

leads? coil pack?

sorry should have mentioned all plugs spark, compression test all above 140psi
thanks burnsy

hi recently checked all plugs, all good colour also tried forte fuel injector cleaner in half tank of fuel. car still has vibration on tickover and slight vibration on higher revs. car feels ok during general driving it,s been great in the snow, :blabla:

Plug leads, when it gets dark look for the plug leads earthing to the engine block.

Buy geninue leads thou as they don't like pattern parts

thanks i will look tonight

looked for sparks from ht leads last night, no sparks. Any other ideas?

try your maf senser, start it up get up to temp and unplug the senser. get some body to keep it running for you..

hi i paid the £60 to have a diagnostic check with a land rover specilist, he thinks its a cracked flexy plate and he woul charge about £1000.00 to replace it. May have to replace torque converter too. Anyone got a flexyplate for a gems 4.6 and a torque converter, Hase any one had any experience of thi problem ?