vtr engine problem (HELP PLZ)

[tryner]

i brought this vtr a few months ago. its a 97 blacktop engine. When i got it i had the tappets adjusted because it was noisey on the top end. I got it back and it was running sweet. IVE done over 1k miles and now its playing up! It will tick over bang on but the sound from the exhaust dont sound normal. it sounds quieter and like its holding back. When im driving along and let off and then try and accelerate again its like it hessertates and holds back then it will pick back up again. but the power seems to of been lost aswell. any ideas what it could be people?
ive put new plugs in and that has done nothing.
it seems to pop and back fire alot when i let off aswell

[AXVTR2]

not over adjusted the tappets??

[tryner]

that could be a possibility..... but wouldnt it of played up straight after they was adjusted? cause it was running mint straight after

[saxo-parts]

if tappets were set too tight then it will lead to rapid valve seat wear/burning, then the valves don't seal properly and you loose power and get backfiring etc. that'd explain why it was ok to start with and got worse over time.

[tryner]

oh right. i will get the garage to check the tappets then thanks for that. Could that of knackered the valve seat mate

[saxo-parts]

hopefully it won't be this as thats a head off job

[tryner]

all is sorted it was just the tappets. i did em my self and its loads better!!!

[saxoKNT]

check the leads going to the spark plugs they might not be providing sufficient current to the plugs.