(T) cant pick up speed on a auto 1.6 brava

i realy dont know what to do here iv got a 1.6 auto brava p reg. iv had a injector dead so got it fixed i have a dead battry every 3rd day or if i dont start the car for a few days and my exhurst is blown on the back box this is my known probs. but last week as i stop at a round abount the car would not move fast when i pressd on the gas it would just spit and sounds like it was going to cut out i had to use kick down just to move over 5mph the fuel light was on so thoght it was that i filld up but still done the same i calld aa and they found one off my ht leads was off pushed it down and car was fine then today it done the same iv check ht leads they are all tight but the ends are a bit crackd.im not sure what i can do.iv got no warning lights i have loads of fuel.meny thanks

Sounds like you need a plug and lead change to start with!
If you have cracked leads they sound quite old and are probally braking down inside or the insualtion is giving up and they are shorting against the engine, take off top engine cover [if you have one] to expose the leads and see if they are in the plastic guides or are they touching the head somewhere if so it will only take one and you get miss fire as it has melted the plastic/rubber coating and is now shorting against the head, best way to spot it is take off cover in daylight, then when it is dark pop the hood and fire it up then have a look at the engine in the dark, you should see - nothing, if you see blue flashes, then there is the culprit - simples - as that rodent on the TV says.
mine did this so I took a look at night it was like a neon blue light show!, don't buy to low a qulity lead set though, I did and had to change them again 4 months later, off the top of my head a lead set is around £40 I think and plugs around £12 a set, for the 1.2, not sure for 1.6.
Have you had a battery check done on your battery, you may have a dead cell draining it, if the battery is ok then you have a current drain from some where, if you don't use it much or for very short trips the boot light is a good start, it may be 'stuck' on, after market radios/sound systems are another source of drain as are aftermarket alarms if not fitted correctly.
But for your running problem I would 1st change leads, then plugs, and go from there, notihng more anoying when you feel it is going down hill with problem after problem..
Oh yes I forgot to say, if you are changing them, change one at a time, don't pull em all off they need to be in the right order!

thanks mate i got new ht leads and plugs today will fit them tomorow.im not sure if the plugs have the right gap do they come allready with the right gap.meny thanks

well that depends on car and plug type.
NGK say
Bravo 1.6 // 1996 - 6/1999 //Plug BKR6EKC // Gap Already set
Bravo 1.6 // 07/1999 onward // Plug BKR5EZ // Gap 0.8mm

Champion OEO30 = BKR6EKC (NGK)
Bosh - FR6LDC = BKR6EKC (NGK)

Hope these help

thanks guys i changed all plugs and leads today but the prob is still there it fills like it want to cut out when i try and pull away but if fine once i pick up speed say over 15mph my back box is bad very rusty and the pipe that is welded to the back has came away from the box would this be my prob iv done a repair on it with gum gum paste just not sure what els this could be meny thanks